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Much like the early entries in the Final Fantasy series, these games have a messy history when it comes to localization. As a result, this page covers the initial Japanese versions, titled Red and Green, the updated Blue revision, and the subsequent international localizations (dubbed Red and Blue) that drew from the latter.

Code and Data#

MissingNo.I'm sorry, I think you've got the wrong number. Internal Index Number1, 2, Pikachu... 3, 4, Exeggutor... Debug FunctionsNintendo and Sony: friends, rivals, and Pokémon trainers. Miscellaneous DataThe famous invisible computer. Unused Move DataShootManyBallsUpward!

Miscellaneous#

Translation ErrorsErrors from when the games were translated from one language to another. Version DifferencesDifferences in versions, as well as localization changes.

Restored Version:

Source Version:

Tipo sin usar#

Encontrado en los juegos de primera y segunda generación, hay un tipo sin usar conocido como "Bird" (Pájaro). Este tipo, el cual carece de resistencias o debilidades, sólo se asigna al Pokémon MissingNo. y se cree que era una versión temprana del tipo volador.

Unused Scripted SFX#

There exists three unused scripted events in which a sound effect would have been played using a text command. For example, the Dewgong cry would have played if the player interacted with an NPC version of Dewgong. However, in that specific case it never gets used as no Dewgong exists on the overworld in the final games, with only a member of the Pokémon Fan Club owning a Seel.

TX_SOUND_POKEDEX_RATING,       SFX_POKEDEX_RATING
TX_SOUND_GET_ITEM_1_DUPLICATE, SFX_GET_ITEM_1
TX_SOUND_CRY_DEWGONG,          DEWGONG

Unused Learned Moves#

Unlike future titles, Pokémon Red and Blue lack a move relearning facility, meaning that there are occasions where a Pokémon may be caught at too high a level to learn certain moves that are in its learnset. Getting these moves on a Pokémon from this generation is only possible through Pokémon Stadium 2's move relearner facility.

Confusion / Disable Mewtwo#

The most notable case is Mewtwo, which has Confusion and Disable in its Level 1 learnset. However, because it learns Barrier at Level 63 and Recover at Level 70, and it's caught at Level 70, it cannot learn them under normal circumstances. Glitches such as Trainer-Fly can allow the Level 1 learnset to manifest.

Wrap Lickitung#

Lickitung can only be obtained via trading a Slowbro, and Slowbro's lowest possible level is 23. At this level, Lickitung learns Defense Curl, which overwrites Wrap. Japanese Pokémon Blue and any version of Yellow fix this by having Lickitung obtainable at a low enough level to not overwrite Wrap.

Starter Dex Entries#

To display the Pokédex entries for the starter Pokémon, the game marks them as owned for a brief time, then shows the Pokédex data screen, and then clears the Pokédex. However, for an unknown reason, aside from just marking Bulbasaur, Charmander, and Squirtle as owned, the code also marks Ivysaur as owned. This doesn't matter in the grand scheme of things, as it gets cleared and the player never gets to see this, but it's still there. Ivysaur was probably not meant to be a starter, and it was likely added into the function by mistake.

Note that this doesn't mark the starters as seen, only owned, as it wasn't necessary for the Pokédex entry to work. However, if it was possible to view the Pokédex's list during this time, the entries, while owned (with a Poké Ball icon) cannot be viewed and are not named, as in the screenshot on the right (unless the player had already seen them, e.g., receiving the gift or as wild Pokémon).

Additionally, if the player already owned Bulbasaur, Charmander, Squirtle, or Ivysaur in the Pokédex prior to viewing the Pokédex entry and backed out, all of those owned entries will be disabled after backing out with B. This also doesn't really matter, however, as there is no way to get Pokémon, and as such the player is expected to not own any Pokémon prior to getting the Pokédex.

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; this function temporarily makes the starters (and Ivysaur) owned
; so that the full Pokedex information gets displayed in Oak's lab
StarterDex:
   ld a, 1 << (DEX_BULBASAUR - 1) | 1 << (DEX_IVYSAUR - 1) | 1 << (DEX_CHARMANDER - 1) | 1 << (DEX_SQUIRTLE - 1)
   ld [wPokedexOwned], a
   predef ShowPokedexData
   xor a
   ld [wPokedexOwned], a
   ret