Meowstic wins by when Mario charges for another attack, he opens his ears, uses hyper beam, the blasts Mario's head of straight to Mars in minutes. Meowstic did not set on fire during the Death Battle.
Invincible stars are only temperamental, so when they last out, there is a cool-off until you can use one again. That gives Meostic the huge advantage as he can defend himself during that period of time
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