I would say
X Scissor ( a good STAB move)
Shadow Claw ( high critical hit ratio) or Shadow Sneak
Endure
Protect
MAKE SURE IT HAS A FOCUS SASH!!!!!!!!
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Shedinja is Ghost/Bug, so basically use Dark,Fire, Flying, Rock or Ghost moves to OTK
Shedinja is hurt only by super-effective moves.
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)
Shedinja, having 1 HP, can be knocked out by any damage-dealing Flying, Rock, Ghost, Fire or Dark type move.
there is only one Pokemon with the ability. its shedinja. the ability allows shedinja to only be hit with super effective moves like fire,dark,rock,flying,and ghost type moves.all other moves have no effect what so ever.the moves 'role play', 'skill swap', and the trace ability can't copy it.