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Missingno is because I need a water and/or electric pokemon and I might as well use a mega so I'm waiting for the full set. I'll probably use Gyarados because I've never used it and I've used Ampharos like a million times. Idealistically I would have a Lanturn for maximum coverage but I doubt it's going to get a mega. I'd use a dunsparce if it was a mega fairy.