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This was proposed last thread for Slaking, but I think it fits better for him.
Slumber: Regigigas always enters the battlefield asleep.
Without the half stats, Regi has amazing bulk and will almost always last the turns. You can also run Sleep Talk or a Chesto Berry. You wouldn't get poisoned by Toxic Spikes, or can send it in to block an incoming status move and waste a turn. this is way too over-powered... probably Ubers material?