Because of the existence of lower tiers I feel like this was an important thing before but with the addition of Little Cup I feel like this is almost like a necessity. I'm suggesting that on your Pokemon window you could have a toggle which if you press it, it prevents your Pokemon from evolving. It's probably one of the worst feelings in PokeMMO to have your Pokemon unintentionally evolve and I thought this would solve this issue easily.   Yes, I'm aware Everstone does the same thing