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Dark/Electric ferret. Known for theft (like ferrets irl) and produces electricity by shuffling and dancing, like the 'weasel war dance' they do. Furret is really cute but doesn't quite have the quintissential triangular ferret face, nor does it have an interesting typing, plus we have tons of species doubles already. If another ferret isn't allowed, a kharza would be perfect. (Pic related)
Dark/Grass tiger pokemon, black with green stripes maybe for camouflage. Could crossbreed with Pyroar as mentioned to make a liger pokemon that's Fire/Grass? Or hell, maybe the type is dependent on the color combination it gets, and it could be any combo of Dark/Grass/Fire/Normal.
A spotted hyena pokemon (Mightyena is based on striped hyenas), maybe Electric/Fire? Could have a bright yellow coat that turns into a firey mohawk mane.