>>32413489I think a Fire/Poison rattlesnake would be the go-to.
I said it in the past but think about it. A fire rattle satisfies the object-oriented channeling of fire that Delphox and Incineroar have. Poison is the only other typing than Dark (Greninja) and Ghost (Decidueye) with blatantly grim connotations.
And they could make it a physical attacker to differentiate it functionally from Salazzle. Then again, Gourgeist and Trevenant were physical and Decidueye turned out physical too, along with Dhelmise.