From Bulbapedia, the community-driven Pokémon encyclopedia.
Please, don't classify Wally as a main game character. He's not important enough to be considered as a rival (you battle him only twice, all other battles are optional rematches). Yes, the RSE actually LACKS a real rival. Remember:
- Main character is a character you can NAME.
- Wally is not a Pokédex Holder in Pokémon Special, which means he's NOT a main character (main characters = 13 Pokédex Holders)
- Wally is NOT an incarnation of Emerald. It was a fantheory, which was proved wrong.