You what, I'm surprised Dragonite didn't get more discussion after Zygarde was banned (or after FSG remade the Dragonite video).
Dragonite, like Zygarde, is a bulky set set-up sweeper that can use a variety of different sets to fit its team.
Of course, Dragonite doesn't have Zygarde's luxury of Thousand Arrows, which is arguably the best move in the game.
However, Dragonite is far from just bootleg Zygarde or Salamence.
The biggest draw to Dragonite is it's hidden ability, Multiscale, essentially giving Dragonite 91/151/160 bulk when ever Dragonite is at full health, and that is just uninvested. And thanks to Heavy-Duty Boots, it can maintain that incredible bulk and lets Dragonite keeps 25% of its HP.
This bulk and HDB also enable defensive variants of Dragonite. Having access to Defog, Haze, Roost, Dragon Tail, and Heal Bell, Dragonite can be a more supportive role on bulkier teams, and it allows Dragonite to check some of the deadliest sweepers in the game.
252 HP/124+ SpD will always survive a +2 Ice Beam from Mega Blastoise, but you can always invest more
+2 252 SpA Blastoise-Mega Ice Beam vs. 252 HP / 124+ SpD Multiscale Dragonite: 326-384 (84.4 - 99.4%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja-Ash Dark Pulse vs. 252 HP / 124+ SpD Multiscale Dragonite: 89-105 (23 - 27.2%) -- 60.7% chance to 4HKO
252 SpA Life Orb Clefable Moonblast vs. 252 HP / 124+ SpD Multiscale Dragonite: 133-156 (34.4 - 40.4%) -- guaranteed 3HKO
252 HP/132 Def can also help it against the likes of NatDex's greatest physical threats too.
252 Atk Metagross Ice Punch vs. 252 HP / 132 Def Multiscale Dragonite: 154-182 (39.8 - 47.1%) -- guaranteed 3HKO
252 Atk Choice Band Kartana Smart Strike vs. 252 HP / 132 Def Multiscale Dragonite: 100-118 (25.9 - 30.5%) -- guaranteed 4HKO
252 Atk Choice Band Kartana Smart Strike vs. 252 HP / 132 Def Dragonite: 201-237 (52 - 61.3%) -- guaranteed 2HKO (Assuming Multiscale was broken)
Ok, getting a bit off track.
Dragonite will primarily be using offensive oriented sets however.
Back to Multiscale, at full health, Dragonite is much harder to revenge kill, surviving x4 hits from Mega Lopunny, Scarf Greninja, Hydregion, and even Specs Dragapult.
The other big draw to Dragonite is Extreme Speed, and having a much more powerful one than Zygarde. Extreme Speed is an extremely effective clean-up tool for Dragonite, as it bypasses its mediocre speed, scarfers, and priority abusers that are not Ghost. This utility was one of Zygarde's greatest traits, and it is something Salamence lacks entirely.
A +1 Extreme Speed from Dragonite will OHKO Scarf Greninja 43.8% of the time after Stealth Rocks, and thanks to Multiscale, can even survive an Ice Beam.
Zygarde can only 2HKO Greninja, and Salamence can't do anything if it isn't at +2 Speed.
Another popular scarfer, Darmanitan-G, is actually only a threat to Zygarde with Rocks up. Extreme Speed will barely kill Darmanitan-G with Dragonite, and Salamence will simply outspeed after a Dragon Dance. Zygarde needs Darmanitan-G to have taken 2 Stealth Rocks before it can possibly KO with +1 Extreme Speed.
Another revenge killer Zygarde would have trouble with Mega Alakazam, having such high Speed, Megazam can outspeed +1 Zygarde, and Megazam is bulky enough to survive a +1 extreme speed, while Dragonite will have a 68.8% chance to OHKO after Stealth Rocks.
The 134 Atk Dragonite uses for stronger Espeed, Outrage, and Z-moves, it also makes Dnite's Earthquake almost as strong as Zygarde's Thousand Arrows.
252+ Atk Dragonite Earthquake vs. 252 HP / 0 Def Mew: 123-145 (30.4 - 35.8%) -- guaranteed 3HKO after Stealth Rock
252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Mew: 135-160 (33.4 - 39.6%) -- guaranteed 3HKO after Stealth Rock
While it is unable to hit Corviknight, Rotom, and other airborne Pokemon, and it is slightly weaker, but that slightly weaker is still incredibly strong and provides great coverage.
Lastly, Dragonite can also spec into its Special side thanks to its great special movepool, with moves like Hurricane, Thunder/Thunderbolt, Blizzard/Ice Beam, Fire Blast/Flamethrower, Draco Meteor/Dragon Pulse, Focus Blast, and Surf, Dragonite has enough coverage to be fully Special, instead of Mixed or not at all, if you want a bulk special attacker.