The thing with Jolteon, is it could probably not switch in for it's life. There are so many high powered Draco Meteors, Outrages, etc. Even with a Special Defense investment, it still has an extremely low HP stat. Also, that Jolteon pretty much gives Groudon or Garchomp a free Swords Dance or Rock Polish, and Lugia is probably not going to care about the +1 Spacial Attack boost very much. (It might OHKO Garchomp instead of 2HKOing it, but that's pretty much it).