From SmashWiki, the Super Smash Bros. wiki
Fire-Type Frenzy is a single-player event match in Super Smash Bros. for Wii U. In it, the player controls Charizard, and must defeat Greninja, Lucario, and Pikachu in a stock match, one appearing after the other as they get KO'd. Only Fire Bars, Fire Flowers, and Superspicy Curry appear as items.
Completing the event on normal or hard difficulty within 70 seconds awards a Lingering Edge Fake Nails equipment.