Hmm, I see that Graveler there so you got some decent power to knock majority of her poison types. Meditite can do alot of work once you get it some physical Psychic moves, and alot more if it has Pure Power as its ability. Klink can be used to soak up some of the Poison moves, but be wary of EQ if any mon has it.
Anyways, some Psychic mons that you can use for her are Inkay,Woobat,Munna, Spoink, and Espurr.
Check this thread Pokemon Location Guide V2 and Reborn EV Training Guide if you're up to adding them onto it.