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Pokémon Amarillo

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This page is a translated version of the page Pokémon Yellow and the translation is 29% complete.
Outdated translations are marked like this.
Other languages:
English • ‎español • ‎polski • ‎日本語 • ‎한국어

Title Screen

Pokémon Edición Amarilla: Edición Especial Pikachu

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.

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.

Pokémon Amarillo es la versión actualizada y acompañante a los juegos Rojo y Azul, que incorpora elementos de la serie homónima' . y también sirvió como inspiración en la clasica novela de John Steinbeck Of Mice and Men.


Read about development information and materials for this game.
Development Info (untranslated)
Read about prototype versions of this game that have been released or dumped.
Prototype Info (untranslated)
Miscellaneous tidbits that are interesting enough to point out here.
Notes (untranslated)


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, which are documented below:

Intercambio sin usar
A pesar de no estar disponible en el juego normal, el intercambio en el juego de Butterfree por Beedrill no utilizado se modificó ligeramente, y el Beedrill recibido cambió su apodo en inglés de "CHIKUCHIKU" a "STINGER".

Equipo Pokémon de depuración
La función de depuración que le da al jugador un equipo fijo de Pokémon vio su selección ligeramente modificada, dando a Amarillo lo siguiente:

  • Snorlax (nivel 80 con movimientos Vuelo, Corte, Surf, y Fuerza)
  • Persian (nivel 80 con movimientos Chirrido, Día de Pago, Golpes Furia, y Cuchillada)
  • Jigglypuff (nivel 15 con movimientos Canto, Destructor, y Anulación)
  • Pikachu (nivel 5 con movimientos Impactrueno, Gruñido, y Surf)
Idioma Offset
Japonés 01:62E2
Inglés 01:623E
Alemán 01:6253
Francés 01:62C7
Italiano 01:628D
Español 01:6285

Main article: Pokémon Rojo y Azul

Audio sin usar

Gritos sin usar

Hay varios clips de voz sin usar para el Pikachu inicial del jugador.

# Cry Transcription Mood
Chuu... Dubious
Pika pika! Excited
11 File:Pokemon Yellow-Pikachu Cry 11.ogg Pika! Excited
PI pika chu! Incensed
Pikapii~ Distressed
Pika, pikachu! Chatty
Pika... pii! Contrary
Chuuuuu! Distressed
Pika... Weary
Pikapikaa! Amused
Piikachu. Declarative
Pikaa! Accusatory
PI-ka. Demonstrative
Piikaachuu... Frustrated
Pikachuu... Suspicious
Pikaapipika. Intrigued
(Source: 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 Stereo Mixing

Normally, the game initializes the various in-game options when first booting the game and just before loading save data. However, if the game's audio is forced into one of the three Headphone (stereo) modes before the introduction plays, the introduction song is revealed to have stereo mixing, just like all the other songs in the game.

Sin embargo, el logotipo de "estrella fugaz" de Game Freak no tendría mezcla estéreo hasta la próxima generación de juegos.

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 hardcoded to always be set to 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 the player from sending out an invalid Pokémon.

Para forzar este tipo de encuentro, ingrese el código de GameShark 010359D0 y luego active un encuentro.

(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, with 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 this unused trade data, but changes the names of the received Pokémon to "MARTY" and "BART" respectively, which are likely cheeky references to Martin "Marty" McFly from Back to the Future, and Bartholomew "Bart" Simpson from The Simpsons.

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
(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 neither 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 is still no way to have a wild encounter with a Dragonite during normal gameplay, leaving its catch rate and subsequently its held item to go completely unused.

(Source: IIMarckus)

Unused Graphics


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.

Pantalla de título

Pokémon Yellow Unused Title Screen tiles.png

The localized 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.

Original Mockup
Pokemon Y Title Screen Logo Final.png Pokemon Y Title Screen Logo MockUp.png

Officer Jenny

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

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


Pokémon Yellow Unused Bulbasaur OW sprite.png

El Bulbasaur en la Ciudad Celeste está completamente estacionario y tiene la espalda contra una pared, lo que evita que el jugador interactúe con él desde atrás y deja su sprite de espalda completamente oculto.


Pokémon Yellow Unused Chansey OW sprite.png

Los Chaney encontrados en el Centro Pokémon y el zoológico en la Ciudad Fucsia son completamente estacionarios, dejando sus sprites traseros y laterales sin usar. Estos sprites pueden técnicamente verse en el juego, aunque requiere hacer uso del glitch de Pikachu fuera de la pantalla.

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 that Pikachu faces a direction 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)

Tileset 00

Pokémon RGBY Unused Flower Tile.png

As it turns out, the unused flower tile from the previous games actually makes a return here, but this time it can now also be found in tileset 00, instead of only tileset 07. Just as before, however, it still gets overwritten in-game, meaning you never get to see it in action.

Original Mockup
Pokémon Y Flower Final.png Pokémon Y Flower MockUp.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. These tiles do not appear in any of the map's blocks.

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

Unused Blocks

Tileset 00

Pokémon RBY Tileset 00 Unused Blocks Y.png

The unused blocks from tileset 00, still as unused as before, but now with updated graphics.

Tileset 19

Pokémon RBY Tileset 19 Unused Blocks.png

  • Naked wall duplicate (03) (used is 05).
  • Messed-up blocks (04 and 08). Respectively the bookshelves and staircase blocks in Blockset 01, as Blockset 19 was built upon it.
  • Standalone cushion (0E). Standalone chair in Blockset 01.
  • Full wall block (11 to 13). Used as padding.

Texto sin usar

Script Text

Wild Encounter
The string brought up by the unused encounter type. Found right after the standard "Got away safely!" string.

Japanese English French German Italian Spanish
はやく にげるのじゃ! Hurry, get away! Vite! Fuyons! Schnell weg! Via, presto!!! Deprisa, vete!

Sea Cottage
Would have likely been uttered by Bill if you tried to leave his house without helping him revert back to his human form. In the final game, you can leave the house at any point without anything dissuading you. Found right before Bill's "I'm a POKéMON..." string.

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!
Hé! Attends! Hey, lauf nicht
Ehi tu, fermati! ¡No te muevas!

Isla Canela
Una línea que se encuentra al final de las cuerdas que usan los entrenadores en el gimnasio de Blaine. Probablemente alguna vez se asignó a un entrenador que finalmente se eliminó.

Japonés Inglés Francés Alemán Italiano Español
クイズに こたえろ! Come on, answer
the question!
Alors, tu
Weißt du etwa die
Antwort nicht?
Avanti, rispondi o
forse non la sai?
¡Venga! ¡Responde
la pregunta!


gritos sin usar

aqui tenemos multiples gritos y voce para el pikachu acompañante del jugador que nunca se usan. esas voces fueron hechas por Ikue Ohtani, la acttris que le ad voz a pikachu en la version japonesa del anime de Pokémon . De 42 gritos, 16 no se utilizan. El estado de ánimo, por supuesto, está abierto a la interpretación del oyente.

Japanese International

These two strings are assigned to the two other unused trades, with "Marty" being assigned to the Pidgeot and "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. Found right before Professor Oak's opening lecture.

Japanese English French German Italian Spanish
メモリが たりません
Not enough Yellow
Version memory.
Mémoire Version
Jaune manquante!
Es ist zuwenig
Speicher frei!
memoria libre!

Version Differences

Revisional Differences

Introduction Cutscene

The two screens which precede the opening cutscene were changed during the game's localization. In the first, the copyright dates were updated. As for the "Game Freak presents" screen, the "presents" graphic doesn't 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 also changed from a stylized "ピカチュウ" (Pikachu) to a simple "Pika!". Border-wise, "POKEMON PIKACHU" was unsurprisingly changed to "POKéMON YELLOW".

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


A lot of the changes which took place in Red and Blue still apply 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 completely inaccessible.


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

Move Animations

The following move animations were changed slightly to avoid rapid flashing; as usual, this is 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

La opción de imprimir las entradas de la Pokédex con la Game Boy Printer estaba deshabilitada en la Consola Virtual. Otras características de Game Boy Printer no se modificaron, aunque esto significa poco, ya que la Game Boy Printer no se puede conectar a Nintendo 3DS.


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.