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There should have been at least 36 Alola Forms instead of 18, and they should have drawn from at least Gens 2 and 4 (the two big "cross gen evolution" generations) in addition to Gen 1 so you could get Alola forms of Kanto Pokemon that went on to get evolutions later. It's a really cool concept, but it feels like they only made a half-hearted attempt at it and I'm kind of worried that they'll stop making new regional forms in successive generations just like they've stopped making Megas.