The problem with Jolteon is it's coverage sucks. Without HP Ice it's walled by Landorus, Gliscor, Garchomp, etc. Without HP Grass it's walled by Mamoswine, Gastrodon etc. Jolteon also loses to Tyranitar which is really common and Tyranitar can even trap it if it doesn't carry Baton Pass. It also can't do much to Ferrothorn and Blissey/Chansey. Also one shouldn't rely on revenge killing Gyarados with Jolteon, as I think most good players would run enough speed to outspeed Jolteon after a DD. It also has trouble doing anything in the sun as Thunder's accuracy decreases to 50% I believe so it needs rain to really be a threat. Not to mention Jolteon is frail as hell. I think Jolteon should stay in C-rank.