Fire and flying. I even think ghost or phycic (one of those 2)
Oh, keep in mind that it's a bug/ghost pokemon.
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Shedinja is hurt only by super-effective moves.
Shedinja is Ghost/Bug, so basically use Dark,Fire, Flying, Rock or Ghost moves to OTK
Shedinja, having 1 HP, can be knocked out by any damage-dealing Flying, Rock, Ghost, Fire or Dark type move.
Most people find value in Shedinja because you have to go through a series of steps to get it and its one and only Ability is Wonder Guard, which allows only super effective moves to damage Shedinja. Unfortunately, Shedinja only has one Hit Point, so if one attack gets through its Ability, you'll find yourself choosing another Pokemon to battle your opponent.
Shedinja is a special Pokemon that has a unique special ability: wonder guard. Effects of wonder guard: Makes all move that are not super effective not hurt Shedinja. Shedinja's type: Bug and Ghost Types of moves that will hurt (or kill, since Shedinja is only 1 hp): Fire, Flying, Rock, Dark etc. Do note that moves that does not inflict damage directly will also work on Shedinja. Examples include toxic (Shedinja will die the next turn due to poison), will-o-wisp (similar reason), or confuse ray (if it hurts itself, it will get hurt like others)