Trip's Frillish was the third Pokemon on Trip's team.
Frillish first appeared in A Rival Battle for Club Champ!, where he was the third and last Pokémon Trip used during his battle with Ash in the Battle Club.
His first opponent was Ash's Pidove, easily winning with a single Water Pulse. He then fought Ash's Snivy, where he used his ability Cursed Body to disable Snivy's attacks before finally beating her with a combination of Water Pulse and Hex.
It was reseen in BW106 in a flashback defeating Ash's Snivy with a Water Pulse and Hex attack.