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Old November 1st, 2010 (05:23 PM).
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colcolstyles
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Join Date: May 2008
Location: The Bay Area
Gender: Male
Nature: Lonely
In a Fire Red ROM, there is a table of data located at the address '0x452c4c'. Each entry in this table contains two pieces of information. One is a pointer and the other is a 32-bit number (I assume this is to keep the alignment consistent). The pointer points to another table and the number specifies the size of that table. In one of these secondary tables, there are a number of entries (the exact number is specified by the number mentioned earlier), each of which are also composed of a pointer and a 32-bit number. These pointers point instead to a list of pokémon and the number dictates the length of that list.

After a bit of research, I determined that the first table of pointers controls the classification of pokémon habitats (e.g., Grassland, Mountain, Rough-Terrain, etc.) as displayed in the PokéDex. The secondary tables specify which pokémon are in each Habitat and which pokémon appear on each "page" of the PokéDex (see the screenshots if you don't know what I mean). Let's look at an example. The first pointer at '0x452c4c' points to '0x4527d4' and is followed by the number '0x1b'. Thus, if you have a complete PokéDex, then there will be 27 ('0x1b' in decimal) pages of pokémon in the Grassland Habitat (the pointers are arranged in the order that they appear in-game, so Grassland comes first). The first pointer at '0x4527d4' points to '0x4524d0' and is followed by the number '0x4'. This means that the first four pokémon at that address are grouped onto one "PokéDex page". In this case, the numbers at that address (after reversing them) are '0x0013', '0x0014', '0x00a1', and '0x00a2', which correspond to Rattata, Raticate, Sentret, and Furret. So, if on the main PokéDex screen you select "Grassland Pokémon", you'll get a screen like this:
Spoiler:


But if we edit that data, we could get something like this:
Spoiler:


So let's say you replaced Machop (a Mountain Habitat pokémon) with a fakemon that you want to go in the Urban Habitat. You should first subtract one from the number of Mountain pokémon (Mountain is the sixth Habitat so the number would be found at '0x452c78') and add one to the number of Urban pokémon (Urban is the eigth Habitat so the number would be found at '0x452c88'). Then you would have to remove the entry for Machop's evolutionary family's page in the Mountain Habitat table and add it somewhere in the table for Urban Habitat pokémon.
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