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Anon! I know the answer, but the explanation is ridiculous actually, it was because gf wanted to give a new secondary type to the alola initials, like they did for kalos, but since rowlett already had a second type this shit happened without meaning, gf wants to get us used to these things, since then they cast with more preswence than before pokemon that don't match their type, like urshifull water secundary, simply "because"!