You keep asking for anti-air and invicibility-frame moves, but Smash isn't really that kind of game. There are lots of variables, lots of positions a character can be in, and one move really isn't ever going to save you.
It's best to get a grip on a number of moves and learn how to use them in succession, rather than focus on one particular attack move.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )