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Pokémon Yellow

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This page contains changes which are not marked for translation.
Other languages:
English • ‎polski • ‎日本語 • ‎한국어

Title Screen

Pokémon Yellow: Special Pikachu Edition

Also known as: Pokémon Version Jaune: Edition Spéciale Pikachu (FR), Pokémon Gelbe Edition: Special Pikachu Edition (DE), Pokémon Edición Amarilla: Edición Especial Pikachu (ES), Pokémon Versione Gialla: Speciale Edizione Pikachu (IT), Pocket Monsters: Pikachu (JP)
Developer: Game Freak
Publisher: Nintendo
Platforms: Game Boy, Super Game Boy, Game Boy Color
Released in JP: September 12, 1998
Released in US: October 1, 1999
Released in EU: June 16, 2000
Released in AU: September 3, 1999


AreasIcon.png This game has unused areas.
CodeIcon.png This game has unused code.
DevTextIcon.png This game has hidden development-related text.
GraphicsIcon.png This game has unused graphics.
ItemsIcon.png This game has unused items.
MusicIcon.png This game has unused music.
SoundIcon.png This game has unused sounds.
TextIcon.png This game has unused text.
DebugIcon.png This game has debugging material.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.


NotesIcon.png This game has a notes page
PrereleaseIcon.png This game has a prerelease article

Pokémon Yellow is the updated companion game to Pokémon Red and Blue, which incorporates elements of the series' eponymous anime. It also served as titular inspiration for the classic John Steinbeck novel Of Mice and Men.

Leftovers

All the unused data from Red and Green and Blue remains in the code of Yellow, virtually all of it unchanged aside from a few exceptions. The changes to the data are documented below.

Unused Trade
Despite remaining unavailable in regular gameplay, the unused Butterfree-for-Beedrill in-game trade was modified slightly, with the received Beedril having its English nickname changed from "CHIKUCHIKU" to "STINGER".


Debug Pokémon Party
The debug function that gives the player a set team of Pokémon saw its selection slightly tweaked, giving Yellow the following:

  • Snorlax: Level 80 (Debug Rom: Level 80, Moves: Fly, Cut, Surf, Strength)
  • Persian: Level 80 (Debug Rom: Level 80, Moves: Screech, Pay Day, Fury Swipes, Slash)
  • Jigglypuff: Level 15 (Debug Rom: Level 15, Moves: Sing, Pound, Disable)
  • Pikachu: Level 5 (Debug Rom: Level 5, Moves: Thundershock, Growl, Surf)
Version Offset
Japanese 01:62E2
English 01:623E
German 01:6253
French 01:62C7
Italian 01:628D
Spanish 01:6285

Main article: Pokémon Red and Blue

Unused Audio

Unused Cries

There are multiple unused voice clips for the player's starter Pikachu.

# Cry Transcription Mood
07
Chuu... Dubious
08
Pika pika! Excited
11
Pika! Excited
12
PI pika chu! Incensed
14
Pikapii~ Distressed
16
Pika, pikachu! Chatty
21
Pika... pii! Contrary
22
Chuuuuu! Distressed
23
Pika... Weary
24
Pikapikaa! Amused
27
Piikachu. Declarative
30
Pikaa! Accusatory
32
PI-ka. Demonstrative
36
Piikaachuu... Frustrated
41
Pikachuu... Suspicious
42
Pikaapipika. Intrigued
(Source: YamaArashi, Pokémon Yellow disassembly.)

Unused Song

This unused track is present only in Yellow, and is located in the sound bank used by the game's extra features, including the "Pikachu's Beach" minigame. As revealed in leaked asset files, this theme was actually meant for Giovanni. Given the track's short loop, this tune was more than likely meant to play when the player talks to him before a battle.

(Source: Helix Chamber)

Unused Code

Unused GB Printer Function

If the Game Boy Printer is properly connected, then calling address 3A:4E79 (referred to as "PrinterDebug" in the game's disassembly project) will mute the game's audio and attempt to use the printer to print a copy of the screen. For unknown reasons, if this is done on the overworld this will also glitch out the arrangement of tile blocks on the map, though the player can Fly/Teleport away if the original map was a normal town/route, otherwise, setting D366 ("wCurMapTileset") to 0x00 will allow the player to escape.

(Source: Pokémon Yellow disassembly, Torchickens, Glitch City Laboratories Forum.)

Unused Encounter Type

Encounter types in Pokémon Yellow are defined by a single byte, with all used types including standard wild Pokémon encounters, those that take place in the Safari Zone, and the encounter initiated during the Old Man's Pokémon-catching tutorial. Encounter type 03, however, goes unused. In this mode, attempting to fight, access the item menu, or switch Pokémon triggers the unique message "Hurry, get away!". The player thus has no choice but to run, though fortunately the chance of escaping from this encounter type is always 100%.

Because this encounter type only exists in Yellow, it may be that players would once have had the option to obtain their own Pikachu beyond the walls of Pallet Town, rather than being forcibly gifted one by Professor Oak before leaving. In this scenario, an encounter mode in which players were forced to escape if their party was empty would be essential for preventing Ash from sending out an invalid Pokémon.


To force this encounter type, input GameShark code 010359D0 and then trigger an encounter.

(Source: Torchickens)

Unused Radness Bonus

PokemonYellow PikaBeach 750.png

The minigame "Pikachu's Beach" has an unused "radness" bonus of +750 points, identifier 0x04, which isn't assigned to any number of flips, be they regular or "special" (forwards-backwards). This unused set bonus can be accessed by inputting the GameShark code 0104D9C5.


(Source: Torchickens)

Unused Trade Data

In addition to the unused trade from Red and Blue, Yellow went ahead and added two more unused in-game trades, possibly placeholder data related to the removal of the in-game trades in Cerulean City and Vermilion City. These two unused trades would allowed the player to trade a Pidgeot for Pidgeot and a Mew for a Mew, both of the received Pokémon having the nickname まつみや (Matsumiya, presumably after Toshinobu Matsumiya, who is listed in the credits of Yellow under Game Scenario). The English localization keeps the unused trade data, but changes the names of the received Pokémon to "MARTY" and "BART", respectively.

The trades themselves are fully functional and can be accessed by inputting the GameShark code found below and using the first glitch item in your bag. Replace "xx" with 02 for the Butterfree for Beedrill trade, 04 for the Mew for Mew trade, or 06 for the Pidgeot for Pidgeot trade, then use the first glitch item in your bag. Please note that this code also has some side effects: in all versions, the player's item data will be changed, and so will the stored Pokémon data.

English version Japanese 1.0 version
01C37FDA
012180DA
01D381DA
01631DD3
013E21D3
01xx22D3
01EA23D3
013D24D3
01CD25D3
013E26D3
015427D3
01CD28D3
01B429D3
013E2AD3
01C32BD3
01D22CD3
01232DD3
01C92ED3
01C3B2D9
01A6B3D9
01D2B4D9
0163A2D2
013EA6D2
01xxA7D2
01EAA8D2
013DA9D2
01CDAAD2
013EABD2
0154ACD2
01CDADD2
01ADAED2
013EAFD2
01C3B0D2
01FFB1D2
0123B2D2
01C9B3D2
(Source: ChickasaurusGL)

Unused Catch Rates

Pokémon Yellow was programmed with a few special considerations to take Generation II's Time Capsule in account, which will translate a Pokémon's catch rate into a held item when transferred. As such, Dragonair and Dragonite's catch rates were lowered from 45 to 27 (Dragonair) and 9 (Dragonite), which makes them significantly harder to catch though none of the two Pokémon can actually be encountered in the wild in Red and Blue. In addition, this changes their held items from a Bitter Berry in Red/Blue to a Protein (Dragonair) and Antidote (Dragonite). While Dragonair can be found in the wild in the Safari Zone in Yellow, there still is no way to have a wild encounter with a Dragonite during normal gameplay, leaving its catch rate and subsequently its held item go completely unused.

(Source: IIMarckus)

Unused Graphics

Leftovers

The unused overworld sprites, unused tiles, and unseen areas all make a return from Red and Blue, unsurprisingly completely untouched.

Game Freak Tiles

Pokémon Red and Blue Unused Presents text.png

While these tiles are used in the Japanese version during the "Game Freak" portion of the intro, they never show up in the localized versions despite still being found in the VRAM. The exact same thing also happened back in Red and Blue.

Title Screen

Pokémon Yellow Unused Title Screen tiles.png

The title screen features a grand total of four unused tiles. The two rightmost ones are identical to the lower end of the "N", but are lower than the corresponding tiles. The leftmost tile, meanwhile, fits perfectly under the "P", a spot already occupied by the "YELLOW" tiles. The middle tile, meanwhile, is rather interesting, as not only does it fit in the blue portion of the "N", but it is directly placed there in the VRAM, only to oddly go unused in the final logo.

Mock-up Final Logo
Pokemon Y Title Screen Logo MockUp.png Pokemon Y Title Screen Logo Final.png

Tileset 13

The tileset for the Summer Beach House on Route 19, despite being incredibly limited, somehow managed to feature two unused tiles. These two tiles are the ones which make up the white rectangle which also goes unused in Tileset 01 and 02.

Tileset Unused Tiles
Pokemon RBY Tile Set 13.png Pokemon RBY Beach House Unused Tiles.png

Officer Jenny

Unused Frames Animated Sprites
Pokémon Yellow Unused Agent Jenny OW sprites.png Pokémon Yellow Unused Agent Jenny OW sprites Animated.gif

Agent Jenny has a full set of walking sprites, though she never walks at any point during the game.

Bulbasaur

Pokémon Yellow Unused Bulbasaur OW sprite.png

The Bulbasaur in Cerulean City is completely stationary and has its back right against a wall, preventing the player to interact with it from behind and leaving its back sprite completely unseen.

Pikachu's Beach

The minigame "Pikachu's Beach" features a few unused sprites:

PokemonYellow PikaBeach Pikachu SB front.png PokemonYellow PikaBeach Pikachu SB back.png
Two unused sprites of Pikachu on its surfboard, one front-facing and one back-facing. In the final game, the only time where Pikachu faces something other than left or right is on the result screen, and even then it isn't on the surfboard.

PokemonYellow PikaBeach Good.png PokemonYellow PikaBeach Yeah.png
Two unused sprites saying "GOOD!" and "YEAH-" which may have been intended as compliments for good gameplay and/or successful flips.

(Source: The Spriters Resource)

Unused Text

Hmmm...
To do:
Add the localized text equivalents.

Script Text

The string brought up by the unused encounter type.

Japanese English French German Italian Spanish
はやく にげるのじゃ! Hurry, get away!


May have been uttered by Bill from inside the teleporter if you tried to leave after you promised to help him revert to his human form. In the final game, you can leave the house at any point without anything dissuading you.

Japanese English French German Italian Spanish
なんや どこ いくんや!
ちょっと まちーな
Whoa, don't go
anywhere, wait!

Safari Zone
May have been intended for when the Player attempts to enter the Safari Zone when having less than the required 500 Poké Dollars. In the final game, the employee at the entrance gate kindly lets you enter, accepting you even if you are entirely out of money.

Japanese English French German Italian Spanish
おかねを もってない ひとは
はいれません!
People who don't carry any money
can't enter!


Cinnabar Island
A string clearly intended for Blaine's gym, though it isn't clear what would have triggered it, as when interacting with the quizz machine your only choice is to either answer yes or no.

Japanese English French German Italian Spanish
クイズに こたえろ! Come on, answer
the question!

System Text

This string is used as the nickname given to the Beedrill from the unused leftover in-game trade.

Japanese International
チクチク STINGER


These two strings are assigned to the two other unused trades, with the one localized as "Marty" being assigned to the Pidgeot and the one localized as "Bart" being assigned to the Mew.

Japanese International
まつみや MARTY
まつみや BART


A string which is only ever used in the case of a memory error.

Japanese Translation
イエローバージョンの
メモリが たりません
Not enough Yellow
Version memory.

Version Differences

Revisional Differences

Introduction Cutscene

The two screens which precedes the opening cutscene where changed during the game's localization. In the first the copyright dates were updated. As for the "Game Freak presents" screen, the "presents" graphic does not appear for some odd reason, despite it still being found in the VRAM.

Japan US
PKMN Y J Copyright Screen.png PKMN Y U Copyright Screen.png
PKMN Y J Game Freak Presents.png PKMN Y U Game Freak Presents.png

Title Screen Changes

The title screen had the logo changed to its international equivalent, the "POCKET MONSTERS" subtitle was removed, the copyright dates were updated, the "Yellow Version" subtitle was added, and the speech bubble was not only repositioned, but its contents were changed from a stylized "ピカチュウ" (Pikachu) to a simple "Pika!". Border-wise, "POKEMON PIKACHU" was unsurprisingly changed to "POKEMON YELLOW".

Japan US
Japanese Pokémon Yellow Title and Border.png International Pokémon Yellow Title and Border.png

Carry-Overs

A lot of the changes which took place in Red and Blue still aplly here. For example, while the overworld tileset was updated for this version, all the tile changes which existed in Red and Blue still apply to their respective localizations. Meanwhile, the town map screen features the same differences between the Japanese and International versions.

Revision 3

The v1.3 release of Japanese Yellow, also known as "Rev 3", fixes a bug in which having Pikachu stand on one of the boulder switches in Victory Road will remove its corresponding wall tiles (as if the player pushed a boulder on to the switch) for all boulder switches but the one found in 1F. This fix was carried over to all localized versions of the game.

(Source: Legendary Starblob, ChickasaurusGL.)

Virtual Console Release

Which version of the game players were able to access via the Virtual Console depended on which region they were in. Japanese players got the original Game Boy version, whereas audiences in other countries got the Game Boy Color version. Because the Japanese VC release is locked to Game Boy mode, its Super Game Boy enhancements are inaccessible. Likewise, because the international VC releases are locked to Game Boy Color mode, both their Super Game Boy borders and their monochrome Game Boy mode are inaccessible.

Jynx

Jynx's sprites in the International Virtual Console re-release were updated to match the Pokémon's updated skin color. While the sprite seemingly appears to use five colors instead of four, something literally impossible for a Game Boy Color game, this effect was simply achieved thanks to some of the 8x8 tiles composing the sprite being assigned an altered palette where black is replaced with purple.

International GBC International VC
PokemonYellowJynxorig.png PokemonYellowJynxBattleorig.png PokemonYellowJynxvc.png PokemonYellowJynxBattlevc.png
(Source: Bulbapedia)

Move Animations

The following move animations were changed slightly to avoid rapid flashing, as usual, to comply with current seizure protection standards.

  • Blizzard
  • BubbleBeam
  • Confusion
  • Dream Eater
  • Explosion
  • Guillotine
  • Hyper Beam
  • Mega Kick
  • Mega Punch
  • Psychic
  • Reflect
  • Rock Slide
  • Selfdestruct
  • Spore
  • Thunderbolt
(Source: Serebii)

Game Boy Printer

The option to print Pokédex entries using the Game Boy Printer was disabled on the Virtual Console. Other Game Boy Printer features were left unmodified, though this means little, as the Game Boy Printer cannot be connected to the Nintendo 3DS.

Trading

Wireless trading was included in the Virtual Console release via the use of a modified emulator that spoofed the Link Cable without affecting the ROM. Moreover, the line "The link has been closed because of inactivity. Please contact your friend and come again!" was changed to "Please come again!"

Pikachu's Beach

The Pikachu's Beach minigame was made available to the player's starter Pikachu, regardless of whether or not it knows Surf. However, the three posters in the Summer Beach House are still programmed to only give the player surfing tips if their party contains a Surfing Pikachu.