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In the Explorers games, Castform has a size of 4 stars for some reason. For Pokemon like Gyarados and Steelix, it makes sense to have a size of 4 stars. Castform, however, looks like it should've gotten a size of 1 star.
Regional kecleon with a different typing perhaps? Maybe an evolution for said regional form too. They could pull another Sirfetch'd/Cursola. Could be interesting.