I have two. Scolipede and Dragalge. No surprise on the first one, lol.
Scolipede, I felt, was one of the first best poison types, with how versatile and defensive it can be. Dragalge is the first poison/dragon type.... WHICH THERE NEEDED TO BE ONE WAY BEFORE SIXTH GEN. UGH.
I love both, and I have a huge love for poison types. c: My favorite are those, and leading up, Skuntank and Toxicroak, Victreebell, Nidoking, and Seviper.
Salazzle is great and all, but not my forte. I wait for the day of ice/poison.