Other Help on Splitting physical and special attacks in gen 3 games
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I am new on hacking and i require method to make physical attacks determined by attack stat and Special attacks determined by sp. attack. Also tell me how to add new abilities and attacks while keeping previous ones. I shall be very thankful to you.
Ability hacking is has far less documentation than move and Pokémon hacking, but it still exists. If I understand correctly, you need to extend certain ability tables and then create pointers to your new, custom routines. I'm not 100% on the details, but I'm fairly certain assembly is required to recreate any of the new abilities in Gen 3. Sorry, I can't really help you there. You might want to check out the work of MrDollSteak and DoesntKnowHowToPlay, I think both of them have managed to at least create some of the newer abilities. I believe HackMew also created routines for updating Flame Body and Magma Armour.
Hm, for Emerald I'm not too sure. Perhaps this tutorial on adding new types to Ruby could help you out, as Ruby and Emerald tend to be quite similar. I can't guarantee that the offsets in that tutorial will be the same for your ROM, though. Sorry.
G3HS has a built-in feature for expanding the FireRed Pokédex. I'm not sure about hacking Emerald, though I believe Chaos Rush has published a tutorial on doing so in the Tools, Tutorials & Resources subforum.