First and foremost, let's weight the pros and the cons. Unfortunately, Keldeo wasn't that popular at the beginning of the SM OU metagame due to its lack of power and the pressure given by new threats such as Tapu Fini, Koko and ultra beasts in general. On the one hand, Keldeo has a really good potential with a great typing and decent stats in a meta where bulky ground-types are prominent. On the other hand, its lack of priority moves, common weaknesses and average speed tier also means that Keldeo is hard to use and needs support to appreciate the offensive meta we're in.
Movesets
The usage statistics from the latest tier update and the viability ranking thread show that Keldeo is gaining popularity and viability. Keldeo can be a great answer to a large part of the SM OU metagame since its choice scarf moveset excels against offensive teams that have poor speed control. Choice scarf Keldeo is the most reliable moveset in the current metagame and can deal with various threats such as landorus and greninja. Keldeo is a pretty solid mon right now and can be considered as the best choice scarf user with garchomp, pheromosa and tapu lele. Keldeo can also learn Stone Edge in gen 7 which means that it could potentially be a Pinsir-mega/Volcarona/flying-type answer. That being said, I would personally prefer hidden power electric on Keldeo since it's a very good revenge killer.
Code:
Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Stone Edge
- Hydro Pump
- Secret Sword
- Surf
Code:
Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Scald
- Hydro Pump
- Secret Sword
- Hidden Power [Electric]
I had built a number of teams, however my two preferred teams were a Metagross Mega Offense and a Charizard X Hyper Offense. I thought that the combination of steel types with Keldeo would make a decent core and both teams sounds particularly great. Keldeo isn't the strongest mon in the metagame and is far from being broken but it require you to provide some specific team support. Metagross Mega is a good teammate and can get rid of keldeo's checks (Tapu Fini, Lati@s, Venusaur Mega...). As a conclusion, I'd say that the metagame is in its favour, however its lack of power (choice scarf) can be a problem if you don't maneuver around your weaknesses well especially when you're bringing offensive cores. To finish with, Keldeo is a very good mon to use, but it should be used very rigorously.
Metagross-Mega @ Metagrossite
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Meteor Mash
- Bullet Punch
- Hammer Arm
- Thunder Punch
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 216 Def / 4 SpA / 16 SpD / 24 Spe
Impish Nature
- Earthquake
- Hidden Power [Ice]
- U-turn
- Knock Off
Keldeo-Resolute @ Choice Scarf
Ability: Justified
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Surf
- Secret Sword
- Icy Wind
- Stone Edge
Pheromosa @ Poisonium Z
Ability: Beast Boost
EVs: 24 HP / 216 Atk / 16 Def / 252 Spe
Naughty Nature
- High Jump Kick
- U-turn
- Ice Beam
- Poison Jab
Ferrothorn (M) @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 68 Def / 188 SpD
Relaxed Nature
- Stealth Rock
- Spikes
- Thunder Wave
- Power Whip
Hoopa-Unbound @ Choice Band
Ability: Magician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Hyperspace Fury
- Drain Punch
- Gunk Shot
- Zen Headbutt
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Meteor Mash
- Bullet Punch
- Hammer Arm
- Thunder Punch
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 216 Def / 4 SpA / 16 SpD / 24 Spe
Impish Nature
- Earthquake
- Hidden Power [Ice]
- U-turn
- Knock Off
Keldeo-Resolute @ Choice Scarf
Ability: Justified
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Surf
- Secret Sword
- Icy Wind
- Stone Edge
Pheromosa @ Poisonium Z
Ability: Beast Boost
EVs: 24 HP / 216 Atk / 16 Def / 252 Spe
Naughty Nature
- High Jump Kick
- U-turn
- Ice Beam
- Poison Jab
Ferrothorn (M) @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 68 Def / 188 SpD
Relaxed Nature
- Stealth Rock
- Spikes
- Thunder Wave
- Power Whip
Hoopa-Unbound @ Choice Band
Ability: Magician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Hyperspace Fury
- Drain Punch
- Gunk Shot
- Zen Headbutt
Tapu Lele @ Terrain Extender
Ability: Psychic Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Psyshock
- Moonblast
- Hidden Power [Fire]
- Taunt
Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Stone Edge
- Hydro Pump
- Secret Sword
- Surf
Excadrill (M) @ Focus Sash
Ability: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Earthquake
- Toxic
- Rapid Spin
- Stealth Rock
Pheromosa @ Fightinium Z
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Quiver Dance
- Ice Beam
- Bug Buzz
- Focus Blast
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
- Earthquake
- Stealth Rock
- Hidden Power [Ice]
- U-turn
Charizard-Mega-X @ Charizardite X
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- Flare Blitz
- Outrage
- Beat Up
Ability: Psychic Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Psyshock
- Moonblast
- Hidden Power [Fire]
- Taunt
Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Stone Edge
- Hydro Pump
- Secret Sword
- Surf
Excadrill (M) @ Focus Sash
Ability: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Earthquake
- Toxic
- Rapid Spin
- Stealth Rock
Pheromosa @ Fightinium Z
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Quiver Dance
- Ice Beam
- Bug Buzz
- Focus Blast
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
- Earthquake
- Stealth Rock
- Hidden Power [Ice]
- U-turn
Charizard-Mega-X @ Charizardite X
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- Flare Blitz
- Outrage
- Beat Up
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