Ok, how do I explain? I would like to just say ''You're just gonna have to accept this and move on'' but I'm not going to. Look. Some abilities are bad to you. I don't know, maybe you think Pressure is useless on Mewtwo cause something like Huge power can make much better use. Then some abilities are bad to me. Maybe I think Swift swim is bad on Kingdra because I don't like spending a turn on move such as Rain dance, and instead I just want to insta Hydro pump or something. It's all about how people saw abilities in battle and that mostly left impression. After reading your stuff I changed my mind about some stuff. So I accept your stuff and move on, and I think you're gonna have to accept my stuff and move on. And while writing this, I acctually tought about Rain dance being good on Kingdra. So, we're good about that? Add some comment if u want, and IDK, we could even open a discussion on PokemonDB. (if it's possible). And if you read last comment on your answer, Aeternis says something is SITUATIONAL. K, good night :D