Wally (Japanese: ミツル Mitsuru) is one of the two rival characters in Pokémon Ruby and Sapphire, Emerald, Omega Ruby, and Alpha Sapphire, the other being Brendan/May. He is the first rival not to be the player's first battle, and the first rival not to receive a starter Pokémon from the selection of starters presented to the player. In Omega Ruby and Alpha Sapphire, Wally in his later battles possesses a Gallade that can Mega Evolve with his handmade wooden Mega Pendant, which holds his Key Stone. The Mega Pendant is shaped like a Gallade's head.
Wally is a young, sickly boy who lives in Petalburg City. Despite his illness, his dream is to train Pokémon. In his room, in Petalburg City, there are a lot of books about how to raise and battle with Pokémon covered in sticky notes, a notebook which has been written and erased again and again and a terrestrial globe with pins in places in the Kalos and Unova regions, suggesting that he has been wanting to go outside and catch Pokémon for a long time.
His illness is never explained, but his symptoms appear to clear up in clean air, suggesting that it is either acute bronchitis or asthma.