Nah, I run Unburden/FakeOut/NormalGem Hitmonlee, one of the most underused sets I can find out there given how brilliant it is. Gyarados will definitely go down. Fake out takes the Multiscale hit so stone edge is full power. Will be a close one on dragonite.
252 Atk Normal Gem Hitmonlee Fake Out
252 HP/128 Def Multiscale Dragonite: 7.25% - 8.81%
41-121 hits to KO (with Leftovers)
252 Atk Hitmonlee Stone Edge
252 HP/128 Def Dragonite: 49.22% - 58.03%
2-3 hits to KO (with Leftovers)
(This is under the assumption that you use Jolly.)
I was thinking the same as you so I thought I'd check.. Not as close as I originally thought. By this point, after that Stone Edge I'd hit Thunder Wave, Roost up and then continue to do so until you missed. At which point, I'd Dragon Dance/Dragon Claw.
(Gotta admit though.. That is some move-set that you are using! Definitely wouldn't be expecting it!)