Editing Trainer Pokemon Moves?

Hey, I just downloaded some stuff for editing pokemon ruby yesterday, and I'm wondering how to change from the default moves in the application "PET", or if it's possible. If not, can anyone point me to an app that can do this? Thanks in advance.

Sorry if this is a naive question, I've just started and have very little idea what I'm doing :p

Pokémon moves are generally decided by the level/species, just like a wild encounter. Your best bet is to writebytetooffset and customize moves that way, or use pre-made ASM routines for this and similar things in the ASM resource thread.

Also, why are you hacking ruby? There's almost no support of it whatsoever...