Started on gen 1. Any one of the first 4 might be the one which i played the most, but I'm betting on gen 3. I think I beat pokemon ruby over 50 times, and had a really great time with emerald as well. Such a great game, such a great continent and so much nostalgia =)
"I've got nothing to give, got no reason to live. But I will fight to survive, I've got nothing to hide, wish I wasn't so shy"