Has anyone thought of the fact that Regigigas now has Protect?
And Shell smash (which would at first negate the stat drops, and then make him superstrong if slow start wears off). Or you could go for a Swords Dance - Extremespeed combo. ;)
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There should be an Ubers version of this metagame too, I reckon... Brave Bird Rayquaza anyone? How about Quiver Dance Genesect? I herd u liek Shift Gear Dialga... =3
Scrappy Rapid spin isn't overpowered at all, you can just re-lay entry hazards or better yet, kill the rapid spinner. Or not rely too much on entry hazards. I would consider it somewhat OP if this was a stally metagame, but its a very offensive one and Kangaskhan doesn't have the best stats or typing in the world (although it does get shell smash) and fears some of the more offensive spikers, like Lando-T.
I DO think that OHKO moves should be banned. No Guard Fissure is too overpowered.