Pokémon FireRed and LeafGreen

Pokémon FireRed Version and LeafGreen Version
Also known as: Pocket Monsters FireRed and LeafGreen (JP/KR) Developer: Game Freak Publishers: The Pokémon Company (JP), Nintendo (INT) Platform: Game Boy Advance Released in JP: January 28, 2004 Released in US: September 9, 2004 Released in EU: October 1, 2004 Released in AU: September 23, 2004 This game has unused areas. This game has unused code. This game has hidden development-related text. This game has unused graphics. This game has unused items. This game has unused text. This game has a hidden sound test. This game has regional differences. This game has revisional differences. This game has a development article This game has a prototype article This game has a prerelease article This game has a Data Crystal page

This page or section needs more images. There's a whole lotta words here, but not enough pictures. Please fix this.

Pokémon FireRed and LeafGreen are remakes of the first two Pokémon games, Red and Green. Aside from a graphical overhaul, features from Ruby and Sapphire were carried over, alongside many new elements, most notably the Sevii Islands.

To do: There may be more unused or normally-unseen text. A text dump can be found here. Apparently, the Japanese version has an unused spin trade function. (source 1 2) Document ROMs from the September 30, 2020 leak, especially the Wireless Union Room ones (there are also three late Japanese prototypes). Everything from October 2024 Game Freak Teraleak.

Sub-Pages

Development Info

Prototype Info

Prerelease Info

Untranslated Text Dump Text found within the game that wasn't translated, including some leftovers from Ruby and Sapphire.

Regional Differences A few more changes this time around.

Unused Graphics Poor Tuber didn't stand a chance…

Unused Maps Sevii Islands leftovers, and more!

Build Dates

Version	FireRed Location	LeafGreen Location	ASCII String
Japanese v1.0	0x1CDE34	0x1CDE10	2003 12 29 23:17
Japanese v1.1	0x1C9704	0x1C96E0	2004 03 01 16:45
US/English v1.0	0x1E9F14	0x1E9EF0	2004 04 26 11:20
US/English v1.1	0x1E9F84	0x1E9F60	2004 07 20 09:30
Spanish	0x1E575C	0x1E5738	2004 07 20 15:50
French	0x1E43FC	0x1E43D8	2004 07 21 13:50
German	0x1E9EC0	0x1E9E9C	2004 07 26 17:40
Italian	0x1E3094	0x1E3070

Build Information

To do: There's more source paths, and more interesting text.

Near the build date info is a plain-text string showing the build path and a few build variables. The Japanese 1.0 revisions use relative paths instead of the full paths, both English revisions (1.0 and 1.1) have this line in full, and the Japanese 1.1 revisions no longer have this information.

• FireRed JP 1.0 (location 1CDE8A) and LeafGreen JP 1.0 (location 1CDE66):

../gflib/malloc.c
 0
 p != NULL
 pos->magic_number == MALLOC_SYSTEM_ID
 pos->flag == TRUE
 pos->next->magic_number == MALLOC_SYSTEM_ID
 pos->prev->magic_number == MALLOC_SYSTEM_ID

• FireRed US 1.0 (location 1E9F68), LeafGreen US 1.0 (location 1E9F44), FireRed US 1.1 (location 1E9FD8), and LeafGreen US 1.1 (location 1E9FB4):

C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c
 0
 p != NULL
 pos->magic_number == MALLOC_SYSTEM_ID
 pos->flag == TRUE
 pos->next->magic_number == MALLOC_SYSTEM_ID
 pos->prev->magic_number == MALLOC_SYSTEM_ID

Debugging Functionality

To do: Search for more.

Sound Check

Sound Check

At least Japanese FireRed v1.0 has the Sound Check like Ruby and Sapphire, except it was removed in localizations this time around.

To access it, patch 0x12f342 to 00 00 00 00 and 0x12f35c to 01 FF 09 08 in a Japanese FireRed v1.0 ROM to replace the New Game entry on the main menu with a call to Sound Check (this has the effect of running Sound Check after the title screen if there is no save file).

The misspelling of the word "stereo" in the Driver Test from Ruby and Sapphire was fixed in the equivalent of FireRed and LeafGreen as well as of Emerald, being now correctly spelled in katakana (ステレオ) instead of hiragana (すてれお), and the entry itself was also moved to the bottom.

Ruby and Sapphire Leftovers

Dusclops Palette Oddity

Dusclops has a single yellow color in its palette that isn't used anywhere, right beside its eye's palette, and it's both on the normal and the shiny palette, suggesting this color was used late into development before being scrapped. This oddity also exists in Ruby and Sapphire, as non-gen 1 Pokémon (except Teddiursa, for whatever reason) did not receive new sprites for FireRed and LeafGreen.

Unused Timer Ball Frame

This Timer Ball frame from Ruby and Sapphire remains unused for the same reason.

Unused	Used

Key Items

Since key items cannot be transferred with a Pokémon, they're unused and most have no effect in FireRed/LeafGreen. The Mach Bike and Acro Bike do work, but act like the normal Bicycle. HM08 (Dive) also works and can be taught to Pokémon, but unlike normal HMs the move can be deleted freely.

Base Decorations

Every secret base decoration and its associated data remains unused within FireRed and LeafGreen; descriptions for these items also remain.

Trainer Sprites

A lot: Archie and Team Aqua, Maxie and Team Magma, Beauties, Cyclists, Hex Maniacs, Gym Leaders, the Elite Four and Champion, etc. While you can battle them in-game through hacking, their Pokémon data is gone, so they don't have any Pokémon to battle with except for Level 5 Ekans (Or, in the case of the Tubers, Level 38 Starmie(Which, itself, is a copy of Swimmer Male Finn's party.).

Additionally, the backsprites of Brendan and May in battle with their send-out animations remain in the game, only able to be seen in normal gameplay by partnering with a player using Ruby, Sapphire, or Emerald in a four-player link Multi Battle.

Tilesets

The indoor tileset and palette from Ruby and Sapphire is leftover at 0x2D4CD4. The block data is also intact, but in a broken state.

Weather

Most overworld weather goes unused, except for regular fog.

Since rain no longer occurs naturally, the related battle message is now unused.

Japanese	English
あめが　ふっている	It is raining.

In both FireRed and LeafGreen, attempting to load overworld sun in any location freezes the game; music continues playing, but player is stuck on a black screen and can't continue.

Scripts

Multiple scripts starting at 0x1638EC in the US 1.0 version remain as leftovers from the first Braille chamber, with the alphabet inscribed in groups of three (ABC, DEF, GHI ...). A room similar to it was likely planned but then scrapped in favor of having a Braille table included in the booklet.

Dive Script

Starting at 0x1BE38B in the US 1.0 Version is the script for checking and prompting the player to use Dive leftover from Pokémon Ruby and Sapphire, along with the behavior byte used for dive tiles.

Additionally, Dive, despite not being used or being available as a HM in this game, still prevents transfer of Pokémon with the move to Diamond, Pearl and Platinum.

Music and Sound Effects

To do: Confirm that the PokéNav and Contest effects are in fact unused and not repurposed.

SE-TRACK-MOVE (sound effect 2B)

SE-TRACK-STOP (sound effect 2C)

SE-TRACK-HAIKI (sound effect 2D)

SE-TRACK-DOOR (sound effect 2E)

Above tracks were used for the moving truck from Ruby, Sapphire and Emerald. Since FireRed and LeafGreen don't have moving trucks, these go unused.

MUS-ME-KINOMI (music 106), used for Berry picking from trees.

Overworld Sprites

Name	Sprites	FireRed Offset	LeafGreen Offset
Brawly		369F28 - 36A227	369F08 - 36A207
Rich Boy/Contestant		372AA8 - 3733A7	372A88 - 373387
Camerman		38D5A8 - 38DEA7	38D588 - 38DE87
Running Triathlete (Female)		384828 - 385127	384808 - 385107

The graphics for Brawly, the Cameraman and the Rich Boy/Contestant have no palette nor frame data assigned to them, but the Running Triathlete does. This has been copied directly from Ruby and Sapphire, however using this in FireRed and LeafGreen results in the sprite being coloured differently as the palette tag ID (1104) now describes a different palette:

Ruby & Sapphire Palette	FireRed & LeafGreen Palette (Unused)

Unseen Text

Is this one of the most accurate remakes yet?

• While not technically unused, this text requires cheating to be seen. If the player interacts with the TV on the ground floor of their house from the sides or back, almost the same text string as from Pokémon Red and Blue appears. The only difference is that FRLG has two extra dots at the end (in the English script)/removed a "ぞ" from the end of the sentence (in the Japanese script).

Oops, wrong side...

みえない・・・・ 

• Pokémon 0000 (Ten question marks) is an error handler which doesn't appear under normal gameplay. Unlike in Ruby, Sapphire and Emerald, if this caught by manipulating the game, it might show a glitched Pokédex entry or one for another valid Pokémon. Nevertheless, it has a fully-coded Pokédex entry in the data. Note some wording differences across languages (vs. Ruby, Sapphire and Emerald).

Japanese	English	French	Italian	German	Spanish
あたらしく　はっけんされたポケモン げんざい　ちょうさちゅう	This is a newly discovered POKéMON. It is currently under investigation. No detailed information is available at this time.	Il s'agit d'un POKéMON découvert tout récemment. Des études le concernant sont encore en cours. Pour le moment, aucune information détaillée n'est disponible.	Specie di POKéMON appena scoperta e attualmente oggetto di attenti studi. Al momento non sono disponibili ulteriori informazioni in merito.	Dieses POKéMON wurde erst vor kurzem entdeckt und wird noch erforscht. Zurzeit sind keine genauen Informationen über dieses POKéMON vorhanden.	Se ha descubierto recientemente. Está en proceso de estudio. De momento no se dispone de datos concretos.

• The map headers for the unused Sevii routes were localized, with the Spanish version getting a little creative, using made-up names instead of plain numbers, like in the used maps.

#	Japanese	English	French	Italian	German	Spanish
6	６ばん　ななしま	SEVII ISLE 6	ILE SEVII 6	SETTIPELAGO 6	SEVII EILAND 6	EXTA ARCHI7
7	７ばん　ななしま	SEVII ISLE 7	ILE SEVII 7	SETTIPELAGO 7	SEVII EILAND 7	SÉTIMA ARCHI7
8	８ばん　ななしま	SEVII ISLE 8	ILE SEVII 8	SETTIPELAGO 8	SEVII EILAND 8	UCTAVA ARCHI7
9	９ばん　ななしま	SEVII ISLE 9	ILE SEVII 9	SETTIPELAGO 9	SEVII EILAND 9	OVENA ARCHI7
22	２２ばん　ななしま	SEVII ISLE 22	ILE SEVII 22	SETTIPELAGO 22	SEVII EILAND 22	IDOS ARCHI7
23	２３ばん　ななしま	SEVII ISLE 23	ILE SEVII 23	SETTIPELAGO 23	SEVII EILAND 23	ITRES ARCHI7
24	２４ばん　ななしま	SEVII ISLE 24	ILE SEVII 24	SETTIPELAGO 24	SEVII EILAND 24	ICUATRO ARCHI7

Unused Music

A chiptune-like version of the MUS-ME-ASA (music 0100), the "Pokémon Healed" theme, which sounds like the original from Red and Blue. It has the label MUS-KAIHUKU in Sound Check and its ID is 0119.

Shiny Celebi

For the sake of consistency, every Pokémon in every game is given a Shiny variant, and Celebi is no exception. However, because the only way to obtain it legitimately was through distributions, the Shiny version of Celebi was left unobtainable through normal means. This sprite may still be seen (in a lighter hue) if a Shiny Pokémon Transforms into a Celebi.

Like "standard" Celebi and many other Pokémon, the sprite is identical to that of Ruby and Sapphire, where it was similarly unobtainable.

Altering Cave

Mareep, Aipom, Pineco, Shuckle, Teddiursa, Houndour, Stantler, and Smeargle were meant to replace the Zubat found in Altering Cave after using Mystery Gift. The event distribution was probably scrapped because these Pokémon can be obtained from Pokémon Colosseum or Pokémon XD: Gale of Darkness, as well as in Emerald on the extended area of the Safari Zone (except Smeargle, which is found in Artisan Cave instead) - despite the fact Emerald also has an Altering Cave with the same design and (lack of) implementation.

Technically, this is implemented by its map script reading a numerical variable and selecting from one of 10 encounter tables (all of which specify only 1 Pokémon).

The game does contain a built-in implementation of an Altering Cave event, which attaches to the deliveryman in the top floor of the Pokémon Center and sequentially switches the selected Pokémon then displays:

Thank you for using the MYSTERY
GIFT System.

Recently, there have been rumors
of rare POKéMON appearances.

The rumors are about ALTERING
CAVE on OUTCAST ISLAND.

Why not visit there and check if
the rumors are indeed true?

ふしぎなおくりもの を ごりよう
いただき ありがとう ございます!
さいきん はずれのしま にある
へんげのどうくつ で
めずらしい ポケモンが でる という
うわさが ながれてる ようです\cぜひ いって たしかめて みては
いかがで しょうか? 

This, however, may not necessarily be indicative of how an official event would have worked.

Unused Code

To do: Isn't this in Ruby and Sapphire?

Diagonal Movement

The movement table, located at 3A64C8, contains the directions the player or an NPC must move in. However, after the first five entries (steady, down, up, left, right), four more follow, resulting in diagonal movement when activated. Using them results in some glitches with warps and map rendering. It should be noted that the games feature buildings with otherwise strange diagonal corners, contrasting with the buildings of the original games.

A video showcasing this diagonal movement can be seen here.

It should also be noted that there are two instances where this type of movement IS used. The first is during the end credits, when the camera pans over the map. The second is in Pokémon Emerald when the camera pans over to Groudon and Kyogre once you fly back to Sootopolis after awakening Rayquaza.

Diagonal movement wasn't implemented for characters or NPCs in any final version until the release of Pokémon X and Y three generations later.

Wild Double Battles

Some data suggests wild double battles were originally planned for this generation, but were delayed until Generation IV. For example, a string "Wild [buffer1] and [buffer2] appeared!" is located at 3FD2BF, and setting only bit 0 in the battle type flag at 02022B4C in the RAM results in such a battle, if used at the right moment.

As with the previous feature, it isn't finished and may result in some bugs.

Unused Trainer Battles

There are several unused trainer battles in the game. Most of them are dummy battles where the battler only has one level 5 Ekans. However, a few have real teams and some of them are cut trainers that existed in Red and Blue. There is one trainer battle in the game for every cut Ruby and Sapphire trainer battle sprite. To experience the battles in-game, the following address has to be freezed to the desired Trainer Battle ID and then any trainer battle has to be initiated.

Version	Address
English	0x020386AE

ID	Trainer
1	Aqua Leader
2	Team Aqua (Male)
3	Team Aqua (Female)
4	Aroma Lady
5	Ruin Maniac
6	Interviewer
7	Tuber (Female)
8	Tuber (Male)
9	Cooltrainer (Male)
A	Cooltrainer (Female)
B	Hex Maniac
C	Lady
D	Beauty
E	Rich Boy
F	PokéManiac
10	Swimmer♂
11	Black Belt
12	Guitarist
13	Kindler
14	Camper (Male)
15	Bug Maniac
16	Psychic (Male)
17	Psychic (Female)
18	Gentleman
19	Elite Four Sidney
1A	Elite Four Phoebe
1B	Leader Roxanne
1C	Leader Brawly
1D	Leader Tate&Liza
1E	School Kid (Male)
1F	School Kid (Female)
20	Sr. and Jr.
21	Pokéfan (Male)
22	Pokéfan (Female)
23	Expert
24	Expert
25	Youngster
26	Champion
27	Fisherman
28	Triathlete (Male, Bike)
29	Triathlete (Female, Bike)
2A	Triathlete (Male, Walking)
2B	Triathlete (Female, Walking)
2C	Triathlete (Male, Swimming)
2D	Triathlete (Female, Swimming)
2E	Dragon Tamer

ID	Trainer
2F	Bird Keeper
30	Ninja Boy
31	Battle Girl
32	Parasol Lady
33	Swimmer♀
34	Camper (Female)
35	Twins
36	Sailor
37	Boarder
38	Boarder
39	Collector
3A	Pokémon Trainer (Wally)
3B	Pokémon Trainer (Brendan)
3C	Pokémon Trainer (Brendan)
3D	Pokémon Trainer (Brendan)
3E	Pokémon Trainer (May)
3F	Pokémon Trainer (May)
40	Pokémon Trainer (May)
41	Pokémon Breeder (Male)
42	Pokémon Breeder (Female)
43	Pokémon Ranger (Male)
44	Pokémon Ranger (Female)
45	Magma Leader
46	Team Magma (Male)
47	Team Magma (Female)
48	Lass
49	Bug Catcher
4A	Hiker
4B	Young Couple
4C	Old Couple
4D	Sis and Bro
4E	Aqua Admin Matt
4F	Aqua Admin Shelly
50	Magma Admin Tabitha
51	Magma Admin Courtney
52	Leader Wattson
53	Leader Flannery
54	Leader Norman
55	Leader Winona
56	Leader Wallace
57	Elite Four Glacia
58	Elite Four Drake
71	Bug Catcher
7C	Lass
93	Camper
A1	Picnicker Hannah on Route 13

ID	Trainer
AE	Super Nerd
AF	Super Nerd
B0	Super Nerd
C8	Biker
D2	Burglar
D3	Burglar
D4	Burglar
D9	Burglar
101	Cue Ball Chase on Route 21
107	Gamer
113	Beauty Lauren (Uses Swimmer♀ Sprite)
11C	Rocker Randall in Vermilion Gym
12B	Tamer John
137	Bird Keeper Reed
138	Bird Keeper Keith
174	Team Rocket Grunt
18B	Cooltrainer Paul
18D	Cooltrainer Gilbert
18E	Cooltrainer Owen
18F	Cooltrainer Berke
195	Cooltrainer Shannon
197	Cooltrainer Brooker
198	Cooltrainer Austina
199	Cooltrainer Julie
1A8	Gentleman Norton
1A9	Gentleman Walter
1C6	Channeler
1C7	Channeler
1C8	Channeler
1C9	Channeler
1CA	Channeler
1CB	Channeler
1CC	Channeler
1CD	Channeler
1EC	Bug Catcher
1ED	Bug Catcher
1EE	Bug Catcher
1EF	Bug Catcher
1F0	Bug Catcher
1F1	Bug Catcher
1FF	Pokémon Prof. Prof. Oak
200	Player Brendan
201	Player May
202	Player Red
203	Player Leaf
212	Biker

Unused Trainer Classes

To do: Put the Player and PKMN Prof. classes in a table and add their ID's.

There are two new unused trainer classes that were added in FireRed and LeafGreen, but are used by unused trainers. These are the Player and PKMN Prof. classes. The former is used four times, and uses the trainer sprites for Red, Leaf, Brendan and May. The latter is used only one time, where it is used for Professor Oak himself as well as his sprite, possibly implying that the unused battle with Oak from the originals was going to be used in this game.

Unused Held Items

Some Pokémon, when found in the wild, have a chance of holding an item. This held item data also exists for some Pokémon which cannot be caught in the wild in the final games. Given how the held item data was carried over, some of these sets are actually used in later series entries.

Unless specified otherwise, all members of a given line share the same held item roster.

#	Pokémon	Held Items	Notes
012	Butterfree	(5%) Silver Powder	Has held item data, while the rest of its line doesn't. Butterfree held a Silver Powder in Gen II, and later in HeartGold and SoulSilver.
015	Beedrill	(5%) Poison Barb	Has held item data, while the rest of its line doesn't. Beedrill held a Poison Barb in Gen II, and later in HeartGold and SoulSilver.
036	Clefable	(5%) Moon Stone	In RSE, it also has a 50% chance of holding a Leppa Berry. The RSE set was later used in the Gen V games, and the Moon Stone-only set in Sword and Shield.
038	Ninetales	(50%) Rawst Berry	In RSE, it has a 100% chance of holding a Rawst Berry. The RSE set was later used in the Gen V games.
040	Wigglytuff	(5%) Oran Berry	Has no held item data in RSE. Could be found in Cerulean Cave in Red and Blue / JP Blue, but not here.
059	Arcanine	(50%) Rawst Berry	In RSE, it has a 100% chance of holding a Rawst Berry.
065	Alakazam	(5%) TwistedSpoon	Later used in Sword and Shield.
068	Machamp	(5%) Focus Band	Has no held item data in RSE. Later used in Sword and Shield.
075	Golem	(5%) Hard Stone	In RSE, it has a 5% chance of holding an Everstone.
083	Farfetch'd	(5%) Stick	Later used in the Gen IV games onward.
085	Dodrio	(5%) Sharp Beak	Used in RSE. Doduo's held item data was removed in FireRed and LeafGreen, but not Dodrio's. Could be found in Cerulean Cave in Red and Blue / JP Blue, but not here.
091	Cloyster	(50%) Pearl (5%) Big Pearl	Later used in the Gen V games onward.
094	Gengar	(5%) Spell Tag	Has no held item data in RSE.
121	Starmie	(50%) Stardust (5%) Star Piece	Later used in the Gen V games onward.
149	Dragonite	(5%) Dragon Claw	In RSE, it has a 5% chance of holding a Dragon Scale. Holds a Dragon Scale in all other games where it can be found in the wild.
151	Mew	(100%) Lum Berry	Used in Emerald as part of the Faraway Island event.
162	Furret	(50%) Oran Berry (5%) Sitrus Berry	Also unused in RSE. Later used in HeartGold and SoulSilver.
170	Chinchou	(5%) Yellow Shard	Used in RSE.
171	Lanturn	(5%) Yellow Shard	Also unused in RSE. Holds a Deep Sea Scale in all other games where it can be found in the wild.
173	Cleffa	(5%) Moon Stone	In RSE, it also has a 50% chance of holding a Leppa Berry.
174	Igglybuff	(5%) Oran Berry	Has no held item data in RSE.
186	Politoed	(5%) King's Rock	Later used in the Gen V games onward.
199	Slowking	(5%) King's Rock	Later used in Black and White and Ultra Sun and Ultra Moon.
203	Girafarig	(5%) Persim Berry	Used in RSE.
208	Steelix	(5%) Metal Coat	Later used in the Gen IV games.
213	Shuckle	(100%) Berry Juice	In RSE, it has a 5% chance of holding an Oran Berry. Intended for the unreleased Altering Cave event.
216	Teddiursa	(50%) Oran Berry (5%) Sitrus Berry	Has no held item data in RSE. Intended for the unreleased Altering Cave event.
217	Ursaring	(50%) Oran Berry (5%) Sitrus Berry	Has no held item data in RSE.
230	Kingdra	(5%) Dragon Scale	Later used in Black and White and Sword and Shield.
233	Porygon2	(100%) Up-Grade	Has no held item data in RSE.
241	Miltank	(100%) Moomoo Milk	Used in Emerald.
242	Blissey	(5%) Lucky Egg	Later used in Ultra Sun and Ultra Moon and Sword and Shield.
251	Celebi	(100%) Lum Berry	Also unused in RSE. Has the same held item data as Mew. Was never obtainable holding this item.
261	Poochyena	(5%) Pecha Berry	Used in RSE.
262	Mightyena	(5%) Pecha Berry	Also unused in RS. Used in Emerald.
263	Zigzagoon	(5%) Oran Berry	Used in RSE.
264	Linoone	(50%) Oran Berry (5%) Sitrus Berry	Used in RSE.
267	Beautifly	(5%) Silver Powder	Also unused in RSE. Holds a Shed Skin in all other games where it can be found in the wild.
269	Dustox	(5%) Silver Powder	Also unused in RSE. Holds a Shed Skin in all other games where it can be found in the wild.
284	Masquerain	(5%) Silver Powder	Also unused in RSE. Later used from Platinum onward.
293	Whismur	(5%) Chesto Berry	Used in RSE.
294	Loudred	(5%) Chesto Berry	Used in RSE.
295	Exploud	(5%) Chesto Berry	Also unused in RSE. Was never obtainable holding this item.
297	Hariyama	(5%) King's Rock	Used in RSE.
300	Skitty	(5%) Leppa Berry	Used in RSE.
301	Delcatty	(5%) Leppa Berry	Also unused in RSE. Only found in White 2, where it instead has a 50% chance of holding a Pecha Berry.
304	Aron	(5%) Hard Stone	Used in RSE.
305	Lairon	(5%) Hard Stone	Used in RSE.
306	Aggron	(5%) Hard Stone	Also unused in RSE. Later used in Ultra Sun and Ultra Moon and Sword and Shield.
315	Roselia	(5%) Poison Barb	Used in RSE.
316	Gulpin	(5%) Big Pearl	Used in RSE.
317	Swalot	(5%) Big Pearl	Also unused in RSE. Later used in Black 2 and White 2.
322	Numel	(100%) Rawst Berry	Used in RSE.
323	Camerupt	(100%) Rawst Berry	Also unused in RSE. Later used in the Gen IV games.
327	Spinda	(5%) Chesto Berry	Used in RSE.
328	Trapinch	(5%) Soft Sand	Used in RSE.
331	Cacnea	(5%) Poison Barb	Used in RSE.
332	Cacturne	(5%) Poison Barb	Also unused in RSE. Holds a Sticky Barb in all other games where it can be found in the wild.
337	Lunatone	(5%) Moon Stone	Used in Sapphire.
338	Solrock	(5%) Sun Stone	Used in Ruby and Emerald.
351	Castform	(100%) Mystic Water	Later used in the Gen IV games.
352	Kecleon	(5%) Prisim Berry	Used in RSE.
353	Shuppet	(5%) Spell Tag	Used in RSE.
354	Banette	(5%) Spell Tag	Used in Sapphire and Emerald.
355	Duskull	(5%) Spell Tag	Used in RSE.
356	Dusclops	(5%) Spell Tag	Used in Ruby.
362	Glalie	(5%) Never-Melt Ice	Also unused in RSE.
366	Clamperl	(5%) Blue Shard	Used in RSE.
369	Relicanth	(5%) Green Shard	Used in RSE.
370	Luvdisc	(50%) Heart Scale	Used in RSE.
371	Bagon	(5%) Dragon Scale	Used in RSE.
372	Shelgon	(5%) Dragon Scale	Also unused in RSE. Holds a Dragon Fang in all other games where it can be found in the wild.
373	Salamence	(5%) Dragon Scale	Also unused in RSE. Holds a Dragon Fang in all other games where it can be found in the wild.
374	Beldum	(5%) Metal Coat	Also unused in RSE. Later used in HeartGold and SoulSilver.
375	Metang	(5%) Metal Coat	Also unused in RSE. Later used in the Gen IV games onward.
376	Metagross	(5%) Metal Coat	Also unused in RSE. Later used in the Gen V games.
385	Jirachi	(100%) Star Piece	Also unused in RSE. Was never obtainable holding this item.

(Source: Pokémon FRLG Disassembly - species_info.h)

Revisional Differences

North America received a v1.1 revision of FireRed and LeafGreen which fixed a couple things. Those changes were taken into account for the non-English European localizations.

US v1.0	US v1.1

• Version 1.0 of the North American release does not show "PRESENTS" on the Game Freak logo screen, although its graphics remain intact. Both Red and Blue and Yellow also lacked the presents text in their localizations, so it may have been an intentional nod. It was later changed in v1.1, now matching the Japanese versions, as well as the international releases of Ruby, Sapphire, and Emerald.

• Version 1.1 fixed a coding mistake which caused category names in the Pokédex to only display the first word, due to the game incorrectly interpreting the space character as a terminating byte. For example, this issue would cause Pidgey to be listed as the "Tiny Pokémon" rather than "Tiny Bird Pokémon".

Version 1.0	Version 1.1
Select “AREA” to display the TOWN MAP with the POKéMON's habitat(s).	Select “NEXT DATA” to display the TOWN MAP with the POKéMON's habitat(s).

• Version 1.1 fixed the description of the Help Menu's "Reading the Pokédex" tab. It originally referred to the "NEXT DATA" option by its Generation I equivalent, "AREA". This error was already present in the Japanese versions of FireRed and LeafGreen, with the help tab using "ぶんぷ" instead of "つぎのデータ".

Version 1.0	Version 1.1
Its pleasantly aromatic leaves have the ability to check the humidity and temperature.	Its pleasantly aromatic leaf has the ability to check the humidity and temperature.

• Version 1.1 fixed Chikorita's FireRed Pokédex entry, now correctly refering to a singular "leaf".

• In v1.0, Tyranitar has the same Pokédex entry in both FireRed and LeafGreen, with it being reused from Gold. In v1.1, Tyranitar has a new Pokédex entry in FireRed, which is a retranslated version of its Silver entry.