Mewtwo Strikes Back
Is it only me or the title is kinda misleading? At first, I thought you mean to expand the total amount of the Pokémon data. But it's not the case, actually. Well, I hacked this already a while ago, but I've lost the offsets (duh). I'll research it again and I'll let you know. By the way: there are many places where the limit is set. Sadly, due to optimization, the limiting value is always embedded into the routine, so all of them need to be edited for the thing to work properly. Last time I did it, I put the maximum amount up to Celebi. Be advised that the first 151 entries are taken directly for the National Dex.