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Base structure Pokédex marker byte

The base structure Pokédex marker byte is a byte in Pokémon Red, Blue, and Yellow and Pokémon Gold, Silver and Crystal found in the ROM at the beginning of a Pokémon's "base stats data structure" (shared attributes for Pokémon of the same family) that is intended to be equal to the Pokémon's Pokédex number.

The Pokédex marker byte may serve as minor detail about a glitch Pokémon's family as it may not be equal to the glitch Pokémon's Pokédex number.

This byte according to Stag019 is supposed to be the same as the Pokémon's Pokédex number, but for many glitch Pokémon it is different. 4h (hex
D6) and MissingNo. in Red/Blue are exceptions. They have a Pokédex marker byte of 0x00, which is the same as their Pokédex number.

The location of a glitch Pokémon family's base stats data can be found using the following:

0x0383DE + (PkmnNo. − 1) × 0x1C

Presumably hybrid glitch Pokémon will have the same Pokédex marker byte as their Pokédex number, due to having their base data derived from real Pokémon.

In Generation II, it is used to determine the Pokédex entry bank.Pokémon Crystal disassembly

List of families and Pokédex marker bytes



In Yellow



Pokémon's Internal IDROM offsetMarker byte
00039FC20x28
176397020xF9
159395260x3C
195399160x62
202399DA0x81
203399F60x87
20539A2E0x86
20739A660x92
21539B460xFE
22939CCE0x01
23039CEA0x5A
23439D5A0x05
24539E8E0x00
25039F1A0x00
25439F8A0x14
25539FA60x1E


In Red/Blue



Pokémon's Internal IDROM offsetPokédex Marker
00039FC20x00
174396CA0xCB
175396E60xC3
20539A2E0x91
20939A9E0x8F
21139AD60xF7
21339B0E0x82
22439C420x05
23439D5A0x60
24039E020x00
24539E8E0x00
25039F1A0x19
25439F8A0x6A
25539FA60x37


References

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