BoltBeam and Psychic provide outstanding type coverage, allowing Mesprit to check some of the biggest threats in OU. High defensive stats allow it to take powerful hits, while above average offensive stats allow Mesprit to deal back decent amounts of damage. Mesprit is able to deal with threats such as Gyarados, Dragonite, Flygon, and Infernape with its great type coverage. Mesprit's only major downfall is the lack of a reliable recovery move outside of Rest. Wish support is always recommended due to Mesprit having to deal with such powerful hits.
This set is designed to KO dangerous OU sweepers such as Gyarados, Dragonite, and Infernape. Even without Special Attack EVs Mesprit is able to OHKO all 4 HP / 0 SpD Gyarados with Thunderbolt after Stealth Rock damage, all offensive Dragonite and Flygon with Ice Beam, and all Naive Infernape with Psychic. The EVs ensure that you never get KOed by these threats in return.
Thunder Wave is the best option in the final slot as it gives Mesprit the chance to cripple faster sweepers and KO them on the following turn. Stealth Rock is another useful option, as it allows Mesprit to score an OHKO on Gyarados when it decides to switch in, and it also renders any Focus Sashes useless. U-turn allows Mesprit to escape an oncoming Tyranitar or Scizor before they are able to severely damage it with Pursuit.Team Options & Additional Comments >>>
Mesprit makes an excellent user of Trick Room in OU due to its below average Speed and brilliant defensive stats. This set retains the ability to remove Gyarados, Dragonite, and Infernape with little trouble, while also allowing Mesprit to set up Trick Room and support slower members of its team. Thunder Wave isn't an option on this set as it will make the opponent slower than you, allowing them to outspeed Mesprit in Trick Room conditions.
Trick Room allows Mesprit to support slow teammates. Thunderbolt and Ice Beam create the BoltBeam combination, giving great type coverage and being resisted by only Magnezone in OU. If Infernape or Gengar cause problems to your team, Psychic is the better option. U-turn allows Mesprit to escape the battle and scout oncoming attacks, as well as potentially bringing in a sweeper unharmed.Team Options & Additional Comments >>>
A great special movepool and high Special Attack make Mesprit an excellent revenge killer. 184 Speed EVs and a Choice Scarf allow Mesprit to outrun common OU threats such as Gengar and Dragonite, while it is able to OHKO them with a super effective move. Psychic is used as a reliable STAB move that hits Gengar and Machamp super effectively. Ice Beam will OHKO Dragonite and Flygon, while dealing huge damage to Celebi and Ground-types. Thunderbolt OHKOes Gyarados, and it also provides excellent type coverage alongside Ice Beam. U-turn allows Mesprit to scout Pursuit users switching in and gain information about the opponent's team. Hidden Power Fire allows Mesprit to hit Scizor super effectively upon its switch-in.Team Options & Additional Comments >>>
Mesprit has an amazing movepool; there are many options to consider. Reflect and Light Screen allow Mesprit to support its teammates while weakening attacks aimed at it. Healing Wish is somewhat risky, but allows Mesprit to restore the health of a deadly sweeper, which opponents may be unable to handle a second assault from. This move may be tempting but the exchange of Mesprit's life is a big turn off. Magic Coat can cripple opponents that try to status Mesprit, which is helpful in OU as many Vaporeon and Blissey use Toxic. Finally, Grass Knot is usable if you lack a way to remove Swampert, but this limits Mesprit's type coverage.
Checks and Counters
Pokemon that resist the BoltBeam combination or take little damage from any specially based attack are great counters to Mesprit. Blissey is every special Pokemon's worst nightmare. With her mammoth HP stat and great Special Defense, she is able to wall Mesprit all day with no problem. Blissey is also able to weaken Mesprit with Seismic Toss as it is unable to recover its health without Rest.
Magnezone is another great option as it takes minor damage from Thunderbolt, Ice Beam, and Psychic, while it is able to hit Mesprit with a STAB Thunderbolt or take most of Mesprit's health with Explosion.
Tyranitar makes an excellent counter to Mesprit as it has an immunity to Mesprit's STAB Psychic, and it also takes a small amount of damage from the BoltBeam combination thanks to the Special Defense boost that sandstorm provides. Choice Band Tyranitar is able to OHKO Mesprit with Crunch 100% of the time, while Pursuit will also OHKO if Mesprit tries to escape.
Scizor makes another fine option as it takes little damage from Psychic or Ice Beam, while Thunderbolt only 4HKOes a Choice Band variant. U-turn will always OHKO Mesprit when Scizor is holding a Choice Band and Mesprit has taken damage from Stealth Rock. Scizor also has access to Pursuit in case Mesprit tries to switch.