>>47766479It's just a superior Kingdra, and on par perhaps with pseudo legends. I don't think it would be broken, but still top tier (more so than it was) in earlier gens.
It would still get out sped by Gar and checked by fellow dragons. Really, the only reason Gyarados wasn't a dragon in the first place is because there wasn't many moves or other dragons to do exactly that. GF would've done it had Gyarados been introduced later.