Jolteon

While Jolteon has blistering Speed, great Special Attack, an immunity to Electric-type moves, and a good support movepool, these traits simply are not enough in DPP OU. Jolteon is extraordinarily frail and very weak to residual damage from sand, entry hazards, and status; most strong neutral hits at least 2HKO it and it is KOed by almost any Earthquake. Jolteon is also highly dependent on its Speed, and any faster attacker, whether holding a Choice Scarf, boosted, or if Jolteon is paralyzed, is likely to OHKO it. Unlike other fast and frail attackers such as Infernape or Gengar, Jolteon possesses neither the offensive firepower nor the utility these Pokemon have. Jolteon is perpetually checked by most Ground-types depending on its Hidden Power type, Tyranitar, Clefable, and Latias due to its lackluster offensive options and it doesn’t have the bulk to use its utility movepool effectively. Jolteon also faces stiff competition from the other Electric-types in the tier, as Zapdos, Rotom-A, Magnezone, and especially Raikou typically do what Jolteon does and more. While Jolteon can theoretically be used alongside these Pokemon to overwhelm their checks, it generally isn’t recommended for use in DPP OU.