I think Mega Steve and the evolved form, Ultimate Steve, are both water-based Pokemon.
The World is a Beautiful Place & I am No Longer Afraid to Die - Ultimate Steve“Our senses wear out so strike us with lightning. Let it tear us apart and shake our being. ‘Cause everything I see and all that I touch isn’t worth believing. Eventually, the world’s gonna end. We should stop our grieving. Let it destroy me. Let it end all suffering. The world will destroy me. Our voices will flood rivers and valleys. The world will destroy me. I am the mountains crumbling.”
Citizen - The Summer
“Why’d you wait for the summer to chew and spit me out? I sit awake and wait impatiently. The same mistakes are waiting to be made.”