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While it may look like an infinite pummel, if you look closely, it's actually pummel with popo and a forward tilt with nana. It's banned in some tournaments, it's an infinite on every character if the ICs are synced when they grab. If you wanna learn it, here u go http://www.smashboards.com/threads/how-to-do-the-infinite-wobbling.95566/
Also I would look up wobbles vs mango evo 2013 if you want to see it in action.

It's always nice to see people interested in melee. Also, I saw your post in the bullying thread. Get some sleep dude! ;]