Best final boss in a Nintendo game

[Proxy-Pie]

uran10 said:
Red - G/S/C - HG/SS
You're fighting against yourself from red/blue FR/LG. How cool is that?

Yeah that was badass, and the damn song!

I liked a lot of final bosses in Nintendo games, including Cackletta in Mario and Luigi Superstar Saga, Mother Brain in Super Metroid, etc.