Lvl 100 Charzard in original red back when I was like 10 years old so I guess that would be 12 years ago. I only used charzard for the most part cause charzard is a beast and the thought of using a team of multiple pokemon didn't appeal to me much. I was just a boy in love with his charzard (looked cooler than most pokemon at the time and fire type is so awsome). I think my charzard was lvl 70 something (kind of ridiculous but I mostly only used him) going into elite four and by the end of it he was level 77. From there I simply got him to 100 by doing the elite four a dozen more times.