taken from a thread I wrote about a year ago
Okay, so this one is a bit easier. To do this, download
this and
this.. Those two things are Nightmare Table Editor and Nightmare Table Editor modules for Pokemon Emerald. Huge thanks to
Agastya for sending me Nightmare.
Now open the Nightmare Table Editor, and open the module that says something about Mossdeep and Steven. In there you get to change the level, movesets, EVs, species and more about Steven's Pokémon. Edit them as much as you want, and set them how you like. To edit Maxie's and Tabitha's Pokémon, open A-Trainer, or any other trainer editor and head to 0x202, which is Tabitha. Edit him as much as you want, then head to 0x2DE, which is Maxie.