Red, back when it first came out.
I even managed to complete the pokedex, including Mew which I traded over from the Blue version I bought years after (thanks to deprecation and price drops). The only one I've ever managed, thanks to the numerous additional pokemon through the generations. Yikes.
Then because there was pretty much nothing else to do, I tried the Missingno thing and then, yeah. Never played it again because it actually scared me a little xd
I even managed to complete the pokedex, including Mew which I traded over from the Blue version I bought years after (thanks to deprecation and price drops). The only one I've ever managed, thanks to the numerous additional pokemon through the generations. Yikes.
Then because there was pretty much nothing else to do, I tried the Missingno thing and then, yeah. Never played it again because it actually scared me a little xd