He didn't steal the belt. He stole the underwear. What we infer from this is the underwear is enchanted to give him muscle, but it does too much so he wears the belt to supress the effect. Mr. Mime will now die under the weight of his own expanding muscles. Green kills so many of her pokemon...
ShadowSonicZ said: Wait...why is the belt giving Mr. Mime muscle (from the looks it)? Isn't the belt suppose to only suppress Machoke/Machamps power back?