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Pokémon No. 152
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Pokémon No. 152 is an accessible 152nd Pokédex entry in Pokémon Red, Green, Blue, and Yellow. The 152nd Pokémon varies between different languages and localizations of the games.

It can be registered as a selectable Pokémon in the Pokédex without having to access the expanded Pokédex (which allows access to Pokémon 153 through to 255).

Registration

The 152nd Pokémon can be registered in the Pokédex using the SRAM glitch to obtain 255 Pokémon, if the first Pokémon is swapped with the tenth.

Other means of registering Pokémon 152 include arbitrary code execution, select glitching (the second type glitch through the 13th item is a known example) and Super Glitch expanded party abuse.

If the game is hacked to create a Pokémon with the Pokédex number 152, or the player obtains the glitch Pokémon アノ ゙ from Pokémon Blue (Japanese) (which has the Pokédex number 152), it can be captured to register a selectable 152nd entry in the Pokédex; however the Rhydon trap still applies.

The 152nd Pokémon can also be registered with the GameShark codes 01FF09D3 and 01FF1CD3 (or 01FF08D3, 01FF1BD3 in Yellow); where the first code registers the 152nd Pokémon as owned, and the second code registers the 152nd Pokémon as seen.

Why it exists?

For storing seen and owned Pokémon in the Pokédex, the developers decided to use 19 addresses (bytes) for "seen" Pokémon (found at D30A-D31C in English Red/Blue) and 19 addresses for "owned" (found at D2F7-D309 in English Red/Blue) Pokémon.

Each bit registers one Pokémon in the Pokédex. The fact that there are 8 bits in a byte means that the Pokédex is able to scroll down to Pokémon 152 (19×8); if bit 0x7 (the eighth bit with bit 0x0 counting as the first) in D31C and/or D309 is set.

The developers decided not to prevent the user from being able to scroll down to Pokémon 152.

Entries

Version 152nd Pokémon Hex ID Decimal ID Real Pokédex number/family
English Red Farfetch'd 40 64 83
English Yellow Scyther 1A 26 123
Japanese Green (v1.0, v1.1) Missingno. A2 162 0
Japanese Blue アノ ゙ CC 204 152
Japanese Yellow (v1.0, Rev A, Rev B, Rev 3) ゾっオ ゙ウ ゙ D4 212 143
French Red Missingno. A2 162 0
French Yellow ァ7ôg C6 198 79
German Red Missingno. A2 162 0
German Yellow g C8 200 0
Italian Red Missingno. A2 162 0
Italian Yellow Scyther 1A 26 123
Spanish Red Missingno. A2 162 0
Spanish Yellow Scyther 1A 26 123


Glitch Pokédex ratings

When 152 Pokémon are counted in Professor Oak's Pokédex evaluation, through Professor Oak's PC, talking to him in his laboratory, or being inducted into the Hall of Fame the player is able to obtain a glitch Pokédex rating.

The results vary by game and localization. In some versions, the rating can freeze the game.

Notably in English Red, viewing the glitched Pokédex rating repeatedly can corrupt data including stored PC Pokémon, game time, wild Pokémon on the current map and send the player to another map after the rating has finished and menus are closed.

This is a method of obtaining an unterminated name glitch Pokémon.