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Locks the user into this move for 3-4 turns. Confuses the user at the end.
Thrash should not be used competitively. Though the Base Power of the move is very high and sports perfect accuracy, Normal has a number of resistances and immunities, and does not hit any type super effectively. Locking the user into this move is rarely a good idea. Its distribution is also quite low.
Body Slam is an alternative which boasts a 30% paralyze chance.
Double-Edge is an alternative with recoil.