>>129664891. That's the whole fucking point, it evolves by being turned upside-down.
2. The typing and the fact that it has a move "brain drain" makes it clear it's meant to be a send-up of a certain classic Dungeons and Dragons monster.
3. Given that we're now in the world of 3D battle models, you don't think a pokemon whose gimmick includes being turned upside down that has a move called "turn over" wouldn't have a unique animation where it actually does flip itself upside down until the move is used again?