One of the best ways to activate Toxic Orb is just revenge kill a 25% Pokemon with quick attack, and then the orb activates on the following turn.
Mh? Aren't U-turn and Volt Switch the best methods for him to activate orb? In NU I play a slow Eelektross with U-turn that helps me activate orbs for my flareon and zangoose. I think something similar can be used in UU.