Hmm, Jolteon is pretty good. You can have him as an Agility/Substitute Passer to a different team member(like your two attackers). It would also be a good idea to breed for one with Hidden-Power Ice-Type, so that he can deal damage to Ground Types.
Good Pokemon to pass to would be Salamence or Flygon(as Earthquake-a move that Jolteon attracts like bees to honey-does not effect them).