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At ABSOLUTE best, if it gets attached to an ability, it'll be a special gimped version of it that only lasts one turn (counting the turn it's swapped in, meaning that if it swaps in mid-turn it'll expire by the time it gets to pick a move. The only time you get take full advantage is if it comes in first turn or on a KO) and only activates once per battle. The mon that has it will probably suck major ass too, no Fake Out, no Follow Me, shit offenses or defenses alongside actually decent speed, probably won't even get Ally Switch.