I made this Jolteon set when I was desperately needing a Rain Dance lead (Other than Electrode, that is). It gets the job done so I decided to share it.
http://smogon.com/dp/pokemon/jolteon
[SET]
name: Rain Dance Lead
move 1: Rain Dance
move 2: Thunder
move 3: Shadow Ball / Hidden Power Water
move 4: Magnet Rise / Baton Pass
item: Damp Rock
nature: Timid
evs: 4 HP / 252 SpA / 252 Spe
Why this set deserves to be on-site:
- Outspeeds common taunters, barring lead Aero (speed-tie).
- Has more attacking options than Electrode.
- Has more special bulk than Electrode.
- Can scout teams with Baton Pass.
- Can come in during mid-game to set up the rain again.
Additional Comments:
- HP Ice over Shadow Ball/HP Water also works.
- A bit bulkier EV set: 56 HP / 200 SpA / 252 Spe
Teammates and Counters:
- Works exceptionally well with Swift Swim sweepers, like Kingdra and Ludicolo. Rain Dance on the first turn, then Baton Pass to the Swift Swim Sweeper.
- SD Ludicolo is a great partner with Jolteon, because it deals with the Pokémon that Jolteon cannot.
- Scizor is helpful in beating lead-Tar. Scizor also benefits from the Rain, since Fire damage is halved.
- Most Taunt leads can't stop Jolteon since its faster than them (mostly).
- Leads carrying Earthquake will decimate Jolteon (if it isn't running Magnet Rise, that is), but most will not stop it from setting up Rain Dance.

http://smogon.com/dp/pokemon/jolteon
[SET]
name: Rain Dance Lead
move 1: Rain Dance
move 2: Thunder
move 3: Shadow Ball / Hidden Power Water
move 4: Magnet Rise / Baton Pass
item: Damp Rock
nature: Timid
evs: 4 HP / 252 SpA / 252 Spe
Why this set deserves to be on-site:
- Outspeeds common taunters, barring lead Aero (speed-tie).
- Has more attacking options than Electrode.
- Has more special bulk than Electrode.
- Can scout teams with Baton Pass.
- Can come in during mid-game to set up the rain again.
Additional Comments:
- HP Ice over Shadow Ball/HP Water also works.
- A bit bulkier EV set: 56 HP / 200 SpA / 252 Spe
Teammates and Counters:
- Works exceptionally well with Swift Swim sweepers, like Kingdra and Ludicolo. Rain Dance on the first turn, then Baton Pass to the Swift Swim Sweeper.
- SD Ludicolo is a great partner with Jolteon, because it deals with the Pokémon that Jolteon cannot.
- Scizor is helpful in beating lead-Tar. Scizor also benefits from the Rain, since Fire damage is halved.
- Most Taunt leads can't stop Jolteon since its faster than them (mostly).
- Leads carrying Earthquake will decimate Jolteon (if it isn't running Magnet Rise, that is), but most will not stop it from setting up Rain Dance.