Yanmega and Yanma both fail at this strategy, Yanmega is used for pure Offense, and Yanma just sucks, even with Eviolite. Ninjask is best suited for this role, as that's all it is used for. By the way, U-Turn does not transfer boosts like Baton Pass would. But if you had to choose between those two, Yanmega is truely superior, Yanma has bad bulk even with Eviolite.