I Got Lots Of Answers For This. Ok, Try These:
Thunder Wave: As Jolteon Has Lower Defenses, the opponet would have a low chance of attacking, saving Jolteon
Signal Beam: I Know You Dont Want It But Shadow Ball Isnt Super Effective On Dark, and Signal Beam Will Do That For You.
Return: Good Power With Max Happiness.
Iron Tail: Good Move For Electric Types, To Cover Rock/Ground Types.
Magnet Rise: Gets Rid Of Ground Weaknesses Giving Jolteon NO Weaknesses.
Charge Beam: To Raise Sp. Attack While Doing Some Damage.
Hope This Helps:)