>>45177873I don't know if Slowpoke is dumb, it's just so slow that it can't properly react to anything. It ends up being very similar to being braindead. As a baseline all Pokemon are capable of communication and domestication so they're all relatively smart, even the ones that are basically just animals like Pidgey or Furret. Like
>>45177894 suggested, a lot of the Pokemon that just let their anger drive them like Rhyhorn, Gyarados, Primeape, Tyranitar, etc. display a clear lack of emotional intelligence that other Pokemon seem to have. It doesn't benefit a wild creature to expend unnecessary energy being angry or destroying its surroundings for no reason. It would be downright detrimental to its survival to do so.