Nidoqueen

Although she is often overlooked for her offensive male counterpart, Nidoqueen has proven herself to be a reliable member on defensive teams. Her unique Poison / Ground typing gives her useful resistances to Rock-, Fighting-, and Bug-type attacks as well as an immunity to Electric-type attacks. Combine these resistances with very solid 90 / 87 / 85 defenses and an immunity to Toxic, and Nidoqueen will find herself with numerous opportunities to switch in and set up Toxic Spikes and Stealth Rock. However, Nidoqueen lacks the stats to use her expansive offensive movepool effectively, and lacks recovery outside of Rest, so having a teammate to buffer any Water-, Ice-, and Psychic-type attacks aimed at Nidoqueen will be required and will greatly increase her longevity, allowing her to continuously support your team.