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I'm really liking the Cubone, Hypno, and Articuno shirts. I'm probably going to buy those three (and pray they fit). I guess that means I'll have to come out of the Pokecloset too, thanks to "Pokemon 151" written on the back of some of the shirts.
I don't know if there's another way to do it, but what I do is try to wheelie just as the POW block goes off. It really helps on Wifi races, since everyone else will still be recovering while you're speeding off (: