Anything you can get ingame - even with the use of an external device like Gameshark - can be used in the Hackmons tiers, with some restrictions in Balanced Hackmons (ban on Wonder Guard, Pure Power, Huge Power, OHKO moves, Shadow Tag, and Arena Trap).
Shadowstrike, Paleo Wave, Rebound, Mountaineer, Persistent, Magikarp's Revenge, and Missingno. can only be used in Custom Games, available through challenges. Shoot me a PM on Showdown some time and I'll show them off if you'd like!
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