Ace Pokémon

Ace Pokémon is a term for the Pokémon that are the strongest and/or first members in the team of their trainer. They are usually kept for the last in a Pokémon battle, but not necessarily.

Brock's Geodude is the only known Ace Pokémon so far. During his both gym battles against, Brock keeps Geodude for the last. In the first battle, Brock is declared as the winner, while he loses in the rematch.