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For doubles, pair Rising Voltage Magnet Regieleki up with Tapu Koko. Curse Regirock with Rock Slide is nice, just pair it up with max SpD and something that can heal it and you’re set. Trick Room Regidraco with Dragon Energy is a pretty good nuke to anything that doesn’t resist it on trick room teams. Regigigas is of course good with Weezing cause of neutralizing gas. Registeel is good for doing it’s usual stuff with Curse. Sadly Regice is kinda shit no matter what you do with it in doubles. I mean you could pair it up with Ninetales-Alola and have the two of them spam Blizzard under Aurora Veil, but there’s not much else you can really do with the thing that makes it a decent choice. Wish it had Snow Warning and that Blizzard boosted ice defense in the same way Sandstorm does SpD for rock types, then it would be an amazing aurora veil abuser.
For singles, Regigigas can toxic-stall decently well and then start hitting hard after Slow Start wears off. Regirock is a pretty decent assault vest user with power up punch being a decent option on it, but curse sets and weakness policy work better overall. Registeel does it’s usual thing with curse pretty well. Regidraco isn’t too good and is too slow for a Dragon Dance set to work well. Regieleki is pretty good for setting up screens and fast, hyper offense teams. Regice again isn’t too viable for singles at all, with it’s Rock Polish set being generally unviable.