Mega Evolution (Charizard)
From the Super Mario Wiki
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Mega Evolution is Charizard's Final Smash in Super Smash Bros. for Nintendo 3DS / Wii U, replacing Triple Finish in Super Smash Bros. Brawl. Charizard Mega Evolves into its Mega Charizard X form, given to it in Pokémon X and Y, allowing it to freely fly around the stage, similar to Yoshi's Super Dragon. Pressing the special move button attacks with Fire Blast, which sends out a fireball that explodes into the kanji 大 (big) when it hits, and the standard attack button is Dragon Rush, which sends Charizard flying in the direction held on the control stick; both attacks deal multiple hits to opponents.
Mega Charizard X cannot flinch from any attacks, but it can still take damage, which decreases how long the Final Smash remains in effect.