"name: SpecsJolt
move 1: Thunderbolt
move 2: Hidden Power Grass / Hidden Power Ice
move 3: Shadow Ball
move 4: Baton Pass
item: Choice Specs
nature: Timid
evs: 4 Def / 252 SpA / 252 Spe
After the Choice Specs boost, Jolteon essentially has a Special Attack stat of 478. Thunderbolt deals massive damage to anything that does not resist it and is even capable of OHKOing max HP / max Special Defense Calm Togekiss 80% of the time when factoring in Stealth Rock. Because Thunderbolt already takes a large chunk of HP away from Shaymin-S and Salamence, Hidden Power Grass is used to more easily combat Swampert and Mamoswine, two Pokemon that otherwise wall the set. Hidden Power Ice allows Jolteon to OHKO opposing Dragonite, Salamence, and Gliscor, and is Jolteon's best option against opposing Grass-types. The combination of Electric and Ice is only resisted by Magnezone in OU and gives Jolteon impressive coverage. Shadow Ball is Jolteon's best option against the Rotom formes and hits Celebi hard, although it doesn't have the power to OHKO. It is also Jolteon's strongest attack against Gliscor if Jolteon opts to use Hidden Power Grass. Baton Pass may seem out of place on this set, but by "dry passing", Jolteon is capable of scouting many of its potential counters, allowing the trainer to switch in another Pokemon accordingly. Signal Beam can be used in place of either Shadow Ball or Baton Pass, allowing Jolteon to OHKO Celebi, however its use is limited outside of that." from smogon.com