Ironically enough even though the Dragonite could have easily made himself as big as his 2 best friends he actually prefers to get up close and personal with his destruction, so he made it where his max size is "only" 10,000 ft tall or just under 2 miles tall. here he is next to a city and standing on top of Mars (before Blaze ate it lol) to give you an idea of how big small he is