You and everyone else. Best I've seen is a 4.8. My personal best is a 4.5. Good luck in your search. Oh, and if/when you find it? Expect to pay a lot. I wouldn't expect any knowledgeable tamer to not understand the value of such a pet. In rareness, it would be on the order of the ethy hiryus, silver steeds, or tamed ancient wyrms. Impossibly rare.