I've been working on maxing out my top 10-13 Gym Defenders since I recently made it to level 35. I've also been evolving my good IV mons. I have a suspicion that Niantic will retire some move sets in tandem with the gym rework. I'm evolving to increase my odds at having more legacy move set mons with good IV's. For example, before gen two dropped and the rebalance happend Dragonite could learn dragon breath and dragon claw. Now it can't learn either. Anyone who has battled a good IV Dragonite knows that this moveset is a beast and a pain to dodge. For that reason if I catch a good Horsea I'm going to evolve it (love dragon breath). Same with bulbasaur, swinub, phanpy, and some other tier 1, 2, and three Mons. If I'm wrong I have a good IV mon with either a good or bad move set so its not much risk and it increases my odds of Legacy move sets if some type of rebalance does happen.