Pokemon Red and Blue back when I was a kid. I stopped playing Pokemon after X & Y though (skipped B&W).
My favorite Nintendo game of all time is a tossup between Super Mario Galaxy/ Super Mario Galaxy 2/ Super Mario Odyssey. Just brilliant purely fun games.
http://www.youtube.com/watch?v=F1gWECYYOSo
Please Watch/Share this video so it gets shown in Hollywood.