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Normal/Dark Poochyena/Mightyena
Despite the 4x weakness to fighting, it seems suitable since Poochy's just a generic baby hyena and Mighty's Pokedex entry seems to imply more normal/less "evil" behavior than other dark types. Also because they're early Route only in RS / every single Route crap in Emerald so an added normal type might work in a gameplay sense.
No appearance change other than lighter coloring or possibly white sclera.