Watt debuted in Watt's with Wattson?. He tended to stand aside and let Wattson do everything, but he served as the referee in Ash's Gym battle for the Dynamo Badge. Watt realized something was amiss when Wattson fled following his defeat, and he later led the group to a nearby abandoned power plant. After Team Rocket's defeat, Watt was relieved that Wattson decided to resume his role as Mauville Gym Leader.
When Ash and his friends returned in Manectric Charge, Watt battled May and her Skitty with his Ampharos. Skitty proved to be stronger and defeated Ampharos. Watt later informed May that a Pokémon Contest was taking place in Verdanturf Town.
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This listing is of Watt's known Pokémon in the anime:
| Ampharos is Watt's only known Pokémon Watt. It first appeared in Manectric Charge, where it used Iron Tail to break Team Rocket's net and release Ash and his friends' Pokémon. Then, its Thunder Shock, combined with Ash's Pikachu using Thunder and Wattson's Electrike using Thunder Wave, was able to send Team Rocket blasting off.
Later in the Mauville Gym, after seeing how well May trained her Skitty, Watt used his Ampharos to test her skills in a battle. Skitty was having a hard time, but was able to fight back in the end, defeating Ampharos.