If you want a poison type, go with nidoking. It's faster and stronger than nidoqueen, and it's special set with sheer force is very good. It learns earth power at level 43 and sludge wave by tm for good stab coverage, and you can also teach it something like shadow ball. If you hold off evolving your nidorino until level 35 you can get toxic spikes as well for good utility. Get it a timid nature with 252 sp. attack and 252 speed.