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Pokémon Yellow

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This page contains changes which are not marked for translation.

Other languages:
English • ‎한국어 • ‎polski

This article is a work in progress.
...Well, all the articles here are, in a way. But this one moreso, and the article may contain incomplete information and editor's notes.
Notes: This page is undergoing reorganization.

Title Screen

Pokémon Yellow: Special Pikachu Edition

Also known as: 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

CodeIcon.png This game has unused code.
MusicIcon.png This game has unused music.
SoundIcon.png This game has unused sounds.
TextIcon.png This game has unused text.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.

Pokémon Yellow is the updated companion game to Pokémon Red & 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.


Unused Cries

There are multiple unused cries for the player's Pikachu companion. These voiceovers were done by Ikue Ohtani, the actress who played Pikachu in the Japanese version of the Pokémon anime. Out of 42 cries, 17 are unused. The mood, of course, is open to the interpretation of the listener.

# Cry Transcription Mood
Chuu~ Dubious
Pika pika! Excited
Pika! Excited
PI pika chu! Incensed
Pikapii~ Distressed
Pika, pikachu! Chatty
Pikachu! Obstinate
Pika... pii! Contrary
Chuuuuu! Distressed
Pika... Weary
Pikapikaa! Amused
Piikachu. Declarative
Pikaa! Accusatory
PI-ka. Remonstrative
Piikaachuu... Frustrated
Pikachuu... Suspicious
Pikaapipika.  ?

(Source: Info - YamaArashi, Sound Files - Pokémon Yellow Disassembly Project)

Unused Song

This unused track is present only in Pokémon Yellow. It is located in the sound bank used by the game's extra features, including Pikachu's beach minigame. It may be related to the unused encounter type described below.

To listen to the track in-game, input the following codes on a GameShark, then access a different map:



Unused Encounter Type

Encounter types in Pokémon Yellow are defined by a single bit. Possible types include standard wild Pokémon encounter, those that take place in the Safari Zone, and the encounter initiated during the Old Man's Pokémon-catching tutorial.

Luckily for TCRF fans, encounter type 03 happens to be 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. Fortunately, the chance of escaping from this encounter type is always 100%.

Because this encounter mode 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. (In this case, the glitch Pokémon "3trainerpoké", who uses identifier 00 and whose moveset draws from unrelated game data incorrectly interpreted as move information.)

To force encounter type 03, input the following code on a GameShark, then trigger an encounter:


Unused Gift Pokémon Function

Pokémon Red and Blue feature a debug function that adds Pokémon to the player's party. This function is also present in every release of Pokémon Yellow, adding the following:

  • Level 80 Snorlax
  • Level 80 Persian
  • Level 15 Jigglypuff
  • Level 05 Pikachu
Function Location
Japanese English German
01:62E2 01:623E 01:6253
French Italian Spanish
01:62C7 01:628D 01:6285

(Source: Glitch City Laboratories Forums)

Unused Minigame Bonus

PikaBeach 750 Yellow.png

Pikachu's beach minigame is unique to Pokémon Yellow. It can be accessed by talking to the man in the house on Route 19, south of Fuchsia City, provided the player's party includes a Pikachu with the same O.T. and Trainer ID as the player, who also knows Surf. (In short, in order to be eligible, the player must have used Pokémon Stadium and Pokémon Yellow's cross-play capabilities to teach Surf to the original Pikachu gifted to them by Professor Oak.)

Its gameplay is similar to Excitebike: Pikachu has a limited amount of time (represented by hit points) to reach shore. Final performance is graded based on the amount of HP remaining, and the number of "radness" points that were earned by performing flips.

There is 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). It can be accessed by inputting the code below with a Gameshark:


Additionally, this code can be used to replace the first move of the first Pokémon in the player's party with Surf:


Unused Trades

To do:
Replace the video with screenshots if needed.

In addition to the unused Butterfree-for-Beedrill in-game trade from Red and Blue, Yellow adds two more unused trades, probably related to the removal of the in-game trades in Cerulean City and Vermilion City: Pidgeot-for-Pidgeot and Mew-for-Mew, respectively. In the Japanese Yellow, both received Pokémon are nicknamed 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 English nickname of the Beedrill from the original games is also changed from "CHIKUCHIKU" to "STINGER", despite still being unused.

(Source: IIMarckus)

The trades are actually fully functional and can be accessed with a Gameshark code. 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 pack. Due note that the code has the side effects of changing your item pack items in all versions and stored Pokémon.

English version Japanese 1.0 version

(Source: ChickasaurusGL)


The Japanese Yellow was a Super Game Boy game, just like Red and Blue. Game Boy Color support was added to the international versions.

Main article: Pokémon Red and Blue

All the unused data from Red, Green, and Blue remains in the programming code of Yellow. There is a small change pertaining to the unused Butterfree-for-Beedrill in-game trade, however: its English nickname was changed from "CHIKUCHIKU" to "STINGER". It otherwise remains unavailable in regular gameplay.

(Source: IIMarckus)


Script Text


Japanese English
はやく にげるのじゃ! Hurry, get away!


Japanese English
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


Japanese English
おかねを もってない ひとは

Cinnabar Island


Japanese English
クイズに こたえろ! Come on, answer
the question!
Japanese English
Japanese English

System Text

Memory Error

Japanese English
メモりガ たりません
Not enough Yellow
Version memory.

Version Differences


Unknown Dungeon Layout

Cerulean Cave (ハナダのどうくつ), known as Unknown Dungeon (ななしのどうくつ) in Generation I, underwent layout changes for every Japanese Generation I release. The first layout was used in Japanese Red and Green, which was changed for Japanese Blue. The latter was retained for Red and Blue's international releases. Both the Japanese and international releases of Yellow had a third, simpler, layout.

The three layouts are pictured below.

Floor 1F
PKMN RG J Unknown Dungeon 1F.png PKMN RB U Unknown Dungeon 1F.png PKMN Y Unknown Dungeon 1F.png
Red JP

Green JP

Blue JP

Red US Blue US

Yellow JP

Yellow US

The 1F layouts in Red, Green, and Blue function as mazes: the player can encounter dead-ends, and has to find the correct ladder in order to proceed. The Yellow 1F has a route that's more linear and easy to navigate.

Floor 2F
PKMN RG J Unknown Dungeon 2F.png PKMN RB U Unknown Dungeon 2F.png PKMN Y Unknown Dungeon 2F.png
Red JP

Green JP

Blue JP

Red US Blue US

Yellow JP

Yellow US

2F is the trickiest floor to navigate. While the ladders remain in the same positions in each of the three layouts, the maze around them differs.

Floor B1F
PKMN RG J Unknown Dungeon B1F.png PKMN RB U Unknown Dungeon B1F.png PKMN Y Unknown Dungeon B1F.png
Red JP

Green JP

Blue JP

Red US Blue US

Yellow JP

Yellow US

The positions of B1F's items are different between layouts. However, each layout features a straightforward path to the final goal: a wild Mewtwo, lying in wait.

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.

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.

Jynx's Appearance

International GBC International VC
PokemonYellowJynxorig.png PokemonYellowJynxvc.png

In the international VC releases, Jynx's sprites were updated to match its Western coloring, made to reduce comparisons to blackface. Thanks to this alteration, Jynx has more colors in its sprite than any other Pokémon in the game.

(Source: Serebii)

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)

Pikachu's Beach Minigame

The Pikachu's Beach minigame has been made available to the player's starter Pikachu, regardless of whether it knows Surf. However, the three posters in the Summer Beach House are still programmed to give the player surfing tips only if their party contains a Surfing Pikachu.


The message "The link has been closed because of inactivity. Please contact your friend and come again!" is changed to "Please come again!"


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.