You can stop feeling jealous about all the people who got to test drive Mewtwo early: the legendary Pokémon is now up for sale in the Smash Bros. shop.
Buying the menacing monster will set you back $3.99, or a little more if you purchase him for both the Wii U and 3DS version ($4.99). You don’t need to purchase the character in order to fight against opponents that have purchased him, thankfully.
If you’d like a refresher on how Mewtwo works/how you can use him effectively, here’s a great breakdown by the folks at Super Smash Academy—it looks like the character is a glass cannon with a lot of attitude:
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