The codes below will insert a special Trainer into your game against who you can battle in the house with the locked room at Mossdeep City (south-east of the Pokemon Center).
All the codes are to be used on the Action Replay v3/4
English Ruby/Sapphire (any version, v1.0/v1.1/v1.2)
These codes are also working on other European and American language versions (English/French/German/Italian/Spanish) but introduction as well as win and lose phrases might be grammaticaly incorrect for some Trainers in non-English games.
Japanese Ruby/Sapphire
Remove Trainer data