[quote=Lugubrious]
Did I miss some sort of rule? Blackbelt is a Pokemon item, after all. Slight boost to fighting-type moves and 'determination'. Chose it more for character than functionality. Hmm...do those items not exist in Mystery Dungeon?
[/quote]

nonononono, that's not the problem

black belt boost the power of super effective attacks by 20%
but none of the attacks of wobuffet receive any boost from it
is like giving a balloon to a rotom fan, I though you made it as a joke