I still remember getting that 'glitch' pokemon on Blaine's island in red/blue. You'd do a couple of certain steps and fly there or something, and on the shoreline you'd encounter this pokemon who's picture looked like a big corrupted file or something and it's name would be like ihjg7324JI7DAS:32/'; or something. You could even catch it and it would switch abilities every time you brought it out. It was awesome.
Edit: Found it, it's called MISSINGO actually. What the fuck was I thinking.
