Clark was known as "The Conductor", and he used a baton to literally "conduct" his Pokémon in battle. He faced Ash in the third and last of the Trainer's Double Battles. During this battle, Clark sent out his Quilava and Charizard against Ash's Grovyle and Glalie. It appeared that Ash had an overwhelming disadvantage, but he kept his cool. Clark made his Pokémon attack using their various Fire-type attacks, while Ash had his Pokémon use their best. Eventually, Grovyle defeated Quilava, but ended up getting knocked out by Charizard's Steel Wing.
Using his Glalie, Ash created several ice pillars, preventing Charizard from coming in and attacking directly with its Heat Wave. It also used the pillars to bounce and evade Charizard's moves. It then used Headbutt to take the win. Ash was then allowed to move on to the next round, while Clark was eliminated from the tournament.
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This is a listing of Clark's known Pokémon in the anime:
Quilava was sent out alongside Charizard during the Double Battle against Ash's Grovyle and Glalie. Quilava put up a good fight against Ash, but despite the type advantage, it was defeated by Grovyle.
Charizard was used alongside Quilava against Ash's Grovyle and Glalie. Because of its powerful Fire-type moves, Charizard succeeded in defeating Grovyle. It fought against Glalie next and because of Glalie's strategy of bouncing off the ice pillars, it confused Charizard and sent it off with a powerful Headbutt attack.