If his spinning and headbutt moves aren't enough, then he'll probably use moves like these:
And/Or some of these moves (To see the ones in the link in action, click below the screenshots).
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Here are some PROS:
* Stafy seems so popular in Japan, Nintendo and a few other companies both created some Stafy merchandise.
* Stafy has plenty of unique moves. However, see the third CON.
* If the third CON is good, then perhaps the SSB series needs an odd character or two.
* Stafy made some cameos and met Wario.
And here are some CONS:
* The Densetsu no Stafy series is Japan/Asia-Only.
* Stafy wasn't mentioned in Sakurai's SSBB poll, which probably means that Sakurai isn't interested in Stafy very much.
* Some of Stafy's moves seem a little too odd for people to understand. Perhaps they were made that way, because Nintendo is a Japanese company, and they wanted to add some odd, Japanese stuff.
* Stafy is probably owned by TOSE more than Nintendo.