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Mandi, otherwise known as Mandi the Astounding, is the character of the day in IL075: Round One - Begin!. He was Ash's first opponent in the Indigo League competition, but he lost because of his arrogance.
Seadra was Mandi's second Pokémon in his Battle with Ash. It's speed was impressive but when it was caught in the foam of Ash's Kingler's Bubble attack it was helpless and eventually it lost.