I would agree with memjee about that Dragonite. First off... if you want Dragonite to not be outclassed by Salamence, you would NEVER run Jolly. Period. Jolly Dragonites are just Salamence-lite. Adamant, however, is pretty awesome. Because of the huge Attack stat, Dragonite will get a big attack bonus just for running Adamant while Jolly can allow you to... hit 284 speed max? That does not help outspeed anything =(
Sure that Mixnite there is a copy + paste wallbreaking Dragonite... which I myself rarely use, but nevertheless effective. In fact, I run a Dragon Dancing one too! But wait... isn't Dragonite supposed to be outclassed by Salamence on Dragon Dancing? Well, not if you take advantage of the one trait it has over Salamence: its overall bulk. That means, invest more in HP to show Salamence who is king (or queen in your case... although my Dragonite is female too).
So in this case, we can run this set of EVs (this is the Dragonite I use quite a lot... the only Salamence I use is Specsmence ):
Dragonite@Leftovers/Dragon Fang/Lum Berry/Yache Berry
Adamant Nature
224 HP/84 Atk/200 Spd
- Dragon Dance
- Outrage
- Roost
- Substitute/Earthquake/Light Screen
I have seen Salamence running very similar sets trying to outlive Lucario and take its Extremespeeds. However, Dragonite has the defensive advantage. With those EVs (assuming 31 IVs everywhere, but change your EVs accordingly to fill in those missing stats if you need to), it will hit:
379 HP/357 Attack/226 Defense/212 Special Attack/236 Special Defense/246 Speed
246 Speed is there to outpace bulky Zapdos and other stuff that like to sit at 245. It also has the advantage of outpacing max speed Jolly Tyranitars... who would lose out a lot of bulk for putting in THAT much speed... and power for using Jolly, so ha! Salamence trying to run a bulky set like that will need to adjust their EVs to 192 HP/120 Def/160 SpD/36 Spe with Adamant nature... and will hit the following stats:
379 HP/336 Attack/226 Defense/230 Special Attack/236 Special Defense/245 Speed
And as you can see, not only will it stick at 245 Speed with the same HP/Def/SpDef as that aforementioned Dragonite, but it also loses out quite a LOT of attack (21 points to be exact)! So the only reason to actually use Dragonite over Salamence would be its overall defenses... and to take advantage of its attack. Do not ever run Jolly on that thing... EVER =(
So here is the explanation. Those stats hits 246 to outpace 245ers and yadda yadda... the HP EVs are, that HP is odd numbered so that you can switch into Stealth Rocks 5 times instead of just 4, and the remaining goes into attack. If you want the optimal leftovers recovery 384 HP, run 244 HP/64 Attack/200 Speed instead, and the attack power still hits 352, which is pretty high.
As for the moveset, Dragon Dance is needed, Outrage is your usual STAB attack and not many things like to eat a STAB Outrage after a DD, Roost is there to heal the dragon's HP when it is low, and Substitute is helpful for scouting. You can replace Substitute with Earthquake so that an unsuspecting Steel who thinks Dragonite will Outrage will switch in to eat an Earthquake instead (note: there are things named Skarmory or Bronzong that will laugh at your face for doing that, but Dragonite has no business dealing with them anyways, at least not this variant). Light Screen is an option just in case something like a Vaporeon wants to come in and Ice Beam the dragon to death and makes Dragonite a better team player.
The items? Well, there is Leftovers if you like extra health recovery, but Dragonite will not be doing as much damage as wanted. Dragon Fang is there because you originally suggested it and it seems that Outrage is the only attack you are planning on using. Lum Berry... well, that somewhat defeats the whole purpose of having Substitute against status, but it is one time use. However, it has another usage: remember Outrage's secondary effect? How it confuses the user after 2-3 turns? Problem solved. Dragonite gets to go on an Outrage for another time! Yache Berry is there to reduce the potency of an Ice attack against Dragonite... it does help and Dragonite is bulky enough to take at least 1 Ice attack... from stuff not named Abomasnow or Glaceon, but that's another story.
Since your Dragonite uses Outrage, make sure you get rid of Steels and other stuff before attempting to sweep with this. Priority move users like that blasted overused Scizor with its Bullet Punch and Lucario with Extremespeed and the most dangerous against Dragonite, Mamoswine with its 130 Attack and STAB Ice Shard (!!!), should be gotten rid of. It is amazing how all three are weak to Fire, is it not? Your Arcanine could deal with Scizor easily, Lucario somewhat, but Mamoswine's EQ should be avoided and it might be lucky enough to survive a Fire attack =|
This Dragonite is a late game sweeper and is bulky enough to live through late game onslaughts not named 6 DD Gyarados =P Use it later in the game once all its threats are out and it will make your opponents cry.
(!!) Gotta go study for a test, bye!