Why haven't Paul's Pokemon turned on him at any point? There have been numerous examples in the anime of Pokemon ignoring, refusing to battle for or even flat-out assaulting their trainers if they feel mistreated, or just for the hell of it (Ash's Charizard comes to mind in all three cases). Considering Paul's heartless mentality (no doubt they've seen many of their fellows go the way of those Starly, Azumarill and Chimchar), tendency to let Pokemon go if they screw up even once (must be rather stressful, yes?) and the way he treats his creatures like tools of war, there's little to keep Ursaring, Weavile and the like from turning him into a chew-toy, or at the very least flat out refusing to fight for him. So why don't they?