u/Real_Yogurtcloset220

Hello, I would like to change the list of Pokemons (and their moveset, item, DVs if possible) that can be used by the opponents in the Crystal Battle Tower. OneGSCTrainer, for example, doesn't allow you to edit these Pokémon : is there any software that lets you do that? Or is it feasable using the Pokémon Crystal disassembly or something similar? Even for a (motivated) beginner in rom hacking?

Thanks in advance for your answers! I hope this is the right subreddit for this question.