Hiromi

ヒロミ

He resides on the Abandoned Ship, looking for his Marshtomp after he accidentally dropped its Poké Ball there many years ago. It turned out that the Pokémon had evolved into a Swampert, which attacked any intruders on the ship.
When the Swampert recognized Tommy as its rightful owner, it rejoined him, and both Trainer and Pokémon became a team once again.
Tommy assisted Ash and his friends in reaching Slateport City by boat.