Why are you suggesting Earthquake for a double battle? That'll kill Jolteon right off. Earthquake is BAD for double battles, unless you're completely compared for it. And since Jolteon can't learn Protect, it's definitely a bad idea.
For Dragonite, the standard DD+Outrage set works fairly well, if you don't mind not having any control over who he attacks.
Dragonite @ Leftovers/ That Berry that cures Confusion
252 Atk/ 182 Spd/ 76 HP (Feel free to change the spread, it's just the one I use, and it's probably crap)
Adamant Nature
-Dragon Dance
-Fire/ Thunder Punch
-Outrage/ Dragon Claw
-Return/ Aqua Tail/ Stone Edge
Of course, given Outrage's power after a DD, it doesn't particularly matter who Dragonite attacks. I don't really know much about Jolteon, so I won't recommend a build for him.
Also, yes, this belongs in Strategies/Movesets.