From Bulbapedia, the community-driven Pokémon encyclopedia.
Dome Ace Tucker (Japanese: ドームスーパースター ヒース, Dome Superstar Heath; French: Takim; German: Tasso; Italian: Tolomeo; Spanish: Tactio) is the Frontier Brain and commissioner of the Battle Frontier's Frontier Dome. His Japanese voice actor is 三宅健太 Kenta Miyake.
Tucker is a superstar and enjoys the sound of a crowd chanting his name. He prefaces battles with narcissistic comments, and if he loses, turns over the Tactics Symbol to the trainer's Frontier Pass.
In the anime
In the anime, Tucker has these Pokémon:
In the games
In Pokemon Emerald, Tucker has these Pokémon when you fight him for the silver Tactics symbol: