Pikachu's "Forbidden Technique"! Well, almost.
Man, I am glad I save replays, even of seemingly mundane matches at first. I just reviewed ones from last night, getting ready to see which ones were worth keeping and which to delete. In one Team Battle, I saw my Pikachu partner fly WAY up the screen, nearly to heights that I normally do with Wario's "Forbidden Technique." I wasn't paying much attention when the match was live, but I knew something seemed weird even then. Here's how it worked:
Basically, the Pikachu grabbed a mushroom during the match, and just before it wore off, he needed to recover. It happened to wear off right while he was doing his Up+B, and he soared way beyond the visible portion of the top of the screen. He remained in free-fall for a good 11 seconds to give you an idea of just how high he went. Originally I wasn't going to save the match since the players were as bad as their item choices, but that glitch more than made up for it. It's awesome to watch, even if the rest of the match sucked.
Now I just need to find a way to exploit this physics glitch with Mario's taunt as it wears off somehow....