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Speaking of custom starters, I tried to find where the mon species/pre-evolved forms were located on Pelipper Island, since those are stored somewhere else. Since Pokemon never take breaks on Pelipper Island, I thought it would be convenient to have these for people to use, in case they wanted to mass-edit mons without having to worry about breaks.
A137A8 (Pokemon 1)
A138B0 (Pokemon 2)
A139B8 (Pokemon 3)
A137E4 (Pokemon 1 First Stage Pre-Evo)
A137EC (Pokemon 1 Second Stage Pre-Evo)
A138EC (Pokemon 2 First Stage Pre-Evo)
A138F4 (Pokemon 2 Second Stage Pre-Evo)
A139F4 (Pokemon 3 First Stage Pre-Evo)
A139FC (Pokemon 3 Second Stage Pre-Evo)
I also forgot to explain how to edit teammate names. Nearby where the pre-evolved stage files are located, the Pokemon's name is written out in hex. Editing it to something else will be able to change the name. Use 00 if the mon's old name still isn't fully overwritten after you're done inputting your new name.