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There's actually an unusual explanation for that. See, despite looking like a cowboy Clay was designed with the idea of a Japanese businessman who made his fortune in America. While at the time this was just a comment by a developer, Legends confirmed this with one of his ancestors being from late-1800's Sinnoh. Given he's the biggest shot in town and probably started the bridge's construction project, he might have noted it looked like a Charizard and the nickname stuck. It's a bit of a stretch, yes, but there's enough true elements to make it work. It's not like a forest looking exactly like a different forest on the other side of the planet for no good reason. At least the Kanto starters in Kalos have the justification of Mega research.
