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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

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 basically Red and Blue, reworked to match the anime more closely. This includes that one yellow mouse everyone loves... right?

"Hurry, get away!"

An unused battling system of identifier 03 exists in the single byte managing what battle system is used (normal, Safari Zone, Old Man, etc.), but is never used in the final releases. Attempting to attack, switch Pokémon, or use an item will give the message "Hurry, get away!" The chance of escaping from a battle in this mode is always 100%.

As this battle mode only exists in Yellow, it could be suggested that Game Freak originally intended players to receive a Pikachu past Pallet Town themselves. If so, this battle system would be essential to prevent the player from sending out an invalid Pokémon of identifier 00 (3trainerpoké) with an invalid moveset corresponding to information from other existing variables in the game. Instead, a battle system was implemented so that Professor Oak would capture a Pokémon (which always has the cry "Pika!").

The battle mode can be triggered by using GameShark code 010359D0 and triggering a battle encounter.

Map Changes

Cerulean Cave (Japanese: ハナダのどうくつ), also known as Unknown Dungeon (Japanese: ななしのどうくつ) during Generation I, was changed for every Japanese release. The Japanese Red and Green had a layout that was changed for the Japanese Blue, and this revision was retained for the international releases of Red and Blue. Yellow had a layout only used for that version, albeit a simpler one.

All comparisons below use the Japanese versions as reference.

Floor 1F

Red and Green Blue (JP)/International Red and Blue Yellow
PKMN RG J Unknown Dungeon 1F.png PKMN RB U Unknown Dungeon 1F.png PKMN Y Unknown Dungeon 1F.png

Notice how the layouts of the cave in the Japanese Red, Green, and Blue are actual mazes: the player will get to dead-ends and has to find the right ladder to proceed. In Yellow, on the other hand, the path was made more linear and straightforward.

Floor 2F

Red and Green Blue (JP)/International Red and Blue Yellow
PKMN RG J Unknown Dungeon 2F.png PKMN RB U Unknown Dungeon 2F.png PKMN Y Unknown Dungeon 2F.png

The most uneventful floor, yet the most tricky to navigate. Basically, the ladders remained in the same position and the maze changed between the revisions.

Floor B1F

Red and Green Blue (JP)/International Red and Blue Yellow
PKMN RG J Unknown Dungeon B1F.png PKMN RB U Unknown Dungeon B1F.png PKMN Y Unknown Dungeon B1F.png

The bottom floor, where item placement also changed, but the layouts generally have a straightforward path to the main reward in all the revisions: Mewtwo.

Unused Music

An unused track present only in Yellow, located in the sound bank of the Pikachu's Beach minigame and the game's extra features. It may be related to the "Hurry, get away!" battle system, although probably not the battle system itself because battle music is located in a separate sound bank.

The track can be played by enabling GameShark codes 0120EFC0 0120F0C0 019F5AD3 and accessing a different map.

Pikachu's Beach 750-Point Bonus

The unused 750 points bonus
The Pikachu's Beach minigame is available via the Dude inside of a house at Route 19, south of Fuchsia City, which only exists in Yellow. Talking to the Dude with a Pikachu knowing the move Surf with the same O.T. and Trainer ID as the player in the party (available via Pokémon Stadium) unlocks a minigame similar to Excitebike where Pikachu has a limited amount of time (HP) to reach a shore and get marked based on remaining HP and the total number of "radness" points earned by flips. There is a rad bonus of 750 points (internal index number of 0x04) but it isn't assigned to any number of flips, regular or "special" (forward-backwards), in the game. It can be accessed with GameShark code 0104D9C5. GameShark code 013972D1 can be used to replace the first Pokémon in the party's first move with Surf.

Unused Cries

To do:
Add more information, if necessary, and the tracks of the cries themselves.

There are multiple unused cries for Pikachu that are various voice types performed by Ikue Ohtani, the Japanese voice actress of Pikachu in the anime.

Unused Gift Pokémon Function

The unused debug function to add Pokémon to the player's party from Red and Blue also exists in Yellow, at 01:62E2 for all versions of Japanese Yellow, 01:623E for English Yellow, 01:6253 for German, 01:62C7 for French, 01:628D for Italian and 01:6285 for Spanish. In all versions of Yellow, four Pokémon are added to the player's party:

  • Snorlax, level 80
  • Persian, level 80
  • Jigglypuff, level 15
  • Pikachu, level 5
(Source: Glitch City Laboratories Forums)

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)

Regional Differences

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

Red, Green, and Blue Leftovers

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)

Virtual Console Revisions

Wireless trading was included, but this was via a modified emulator spoofing the Link Cable and did not affect the ROM of the game. Additionally, due to different regions getting different versions of the game, the same applies to the Virtual Console release. Japan got the original Game Boy version, whereas everyone else got the Game Boy Color version. The Japanese release is locked in Game Boy mode, so Super Game Boy enhancements are inaccessible, and international versions are locked in Game Boy Color mode, so both the Super Game Boy borders and monochrome Game Boy mode are inaccessible.

Pikachu's Beach Minigame

The Pikachu's Beach minigame is available to the player's starter Pikachu, instead of a Pikachu which knows the move Surf. However, the three posters in the Summer Beach House are still programmed to give surfing tips only if a Pikachu that knows Surf is in the party.

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)


International GBC International VC
PokemonYellowJynxorig.png PokemonYellowJynxvc.png

Exclusively in the International Pokémon Yellow Virtual Console releases, Jynx's sprites were altered to match its modern Western appearance. Since the Japanese Pocket Monsters: Pikachu is not Game Boy Color-enhanced, it was not affected by this change. Interestingly, through this change, Jynx now has more colors in its sprite than any other Pokémon in Yellow.

(Source: Serebii)


The option to print Pokédex entries using the Game Boy Printer is disabled. Other Game Boy Printer features are left unmodified, but are not very effective, since the Game Boy Printer cannot be connected to the Nintendo 3DS.

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