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Hydreigon was a surprise for me. Metagross/Salamence are the only other pseudos I use with any regularity, but I trained up a Hydreigon during W1's postgame and it was a powerhouse against the E4. But I was also surprised by how well it could keep up as a Zweilous with Eviolite. It honestly didn't feel like a burden at all despite the crazy level requirements to evolve.