Regice

Ash's Pikachu battled and defeated Pyramid King Brandon's Regice in Pace - The Final Frontier!, thus making it only the second legendary Pokémon to lose a battle in the entire anime series, after Noland's Articuno, which had earlier lost to Ash's Charizard.It appeared again in A Pyramiding Rage!, where Brandon used it in his battle with Paul. It battled Paul's Ursaring and easily took out his Lairon.It was seen again in Pillars of Friendship! where it was used to battle the rampaging Regigigas at the Snowpoint Temple. Regigigas used Confuse Ray on Regirock, Regice and Registeel and all four Pokémon went on a rampage. All the rampaging Pokémon (except Regigigas) faded away, and when J used her weapon to catch the immobilized Regigigas and Regirock, Regice and Registeel and eventually Pyramid King Brandon all jumped in front of J's firing range and were frozen. Regigigas eventually brought them back to life with Hidden Power.