Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 Def / 252 Spe
Timid Nature
- Hydro Pump
- Scald / Icy Wind
- Sacred Sword
- Hidden Power Electric / Hidden Power Ice
Role: Late-game Cleaner, Revenge Killer
What It Does: Base 129 Special Attack and base 108 Speed make Keldeo a very capable Choice Scarf Pokemon. When given maximum EVs in SpA and Spe with a +Spe Nature, Keldeo can revenge kill common offensive threats such as Greninja, Landorus and Gyarados. It also isn't uncommon for Scarfed Keldeo to be a win condition thanks to its powerful STAB coverage and high speed stat. Hydro Pump is a base 120 Water-type STAB move that can easily KO weakened Pokemon that do not resist it. Scald has the merit of being 100% accurate while boasting the chance of being able to burn the opposition which may prove to be useful in the long run. Alternatively, Icy Wind is great for Ice-type coverage and slowing down faster threats that can potentially outspeed a Scarfed Keldeo. Sacred Sword is Fighting-type STAB and possesses the interesting property of using Keldeo's Special Attack stat to deal damage to the opponent's Defense stat, much like Psyshock. HP Electric is useful for revenge killing Gyarados while HP Ice is favored for revenge killing Dragonite and Garchomp
Good Teammates: Choice Banded Tyranitar is phenomenal for taking out Keldeo's few answers, namely Lati@s, Mega Slowbro and Mega Venusaur. Landorus-I also works well because of its ability to severely weaken defensive Pokemon with Sheer Force boosted moves. Politoed's Drizzle ability makes Keldeo a deadly late game cleaner as not much can freely switch in on rain boosted, STAB Hydro Pump from Keldeo
What Counters It: Lati@s, Mega Slowbro, Mega Venusaur, Amoonguss, Sylveon and Celebi are all capable of taking down Keldeo 1v1 thanks to their resistances and ability to KO Keldeo back with their STAB moves.
Any Additional Info: Always keep Keldeo around for the late-game. As previously mentioned, Scarfed Keldeo is a phenomenal revenge killer and late game cleaner and there is no reason to count it out as a win condition.