[SET]
name: Choice Scarf (Rock)
move 1: Close Combat
move 2: Stone Edge
move 3: Iron Head / Rock Slide
move 4: Earthquake / Rock Slide
item: Choice Scarf
ability: Justified
nature: Jolly
evs: 252 Atk / 4 Def / 252 Spe

[SET COMMENTS]
Moves
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Close Combat is a reliable STAB attack that punches holes into the opposing team
Stone Edge covers the Flying-, Psychic-, Poison-, and Ghost-types that Close Combat misses out on
Terrakion will typically only need Close Combat and Stone Edge throughout a match, so the final two moveslots are adjustable to what you prefer on your team
With Earthquake, Terrakion can chip away at Doublade's health, which completely walls and sets up on Terrakion
Iron Head makes it easier to beat some Fairy-types such as Clefable and Mega Diancie as it has great accuracy and a useful chance to flinch
Rock Slide may be used alongside Stone Edge to safely secure KOs against weakened targets, where the power difference between the two moves doesn't make a difference

Set Details
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Choice Scarf turns Terrakion into one of Rock Monotype's best revenge killers, and it helps it overcome its crowded Speed tier
The EV Spread maxmizes Attack and Speed
Justified is Terrakion's only ability, but, even though it is situational, the Attack boost that it grants is still useful.

Usage Tips
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Don't bring it out until late-game, when the opposing team is weakened, as Choice Scarf Terrakion has trouble breaking down walls
Operates best as a cleaner
Don't actively seek out these boosts from Justified. Terrakion has very common weaknesses and doesn't easily switch into attacks, and losing its item to Knock Off hinders it from serving as a useful revenge killer as well.

Team Options
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While Choice Scarf Terrakion doesn't particularly need more Speed, Sticky Web Shuckle lets Terrakion outspeed Sand Rush Excadrill, which is one of the hugest threats to Terrakion
Calm Mind Mega Diancie, Shell Smash Omastar, and Choice Band Tyrantrum are examples of wallbreakers that make it easier for Terrakion to break through Skarmory and other physical walls
Mega Aggron and Pursuit Tyranitar remove Fairy-types and Psychic-types, respectively, and make it easier for Terrakion to spam Close Combat
Cradily appreciates having a teammate such as Terrakion that can revenge kill setup sweepers that set up on Cradily, like Mega Gyarados, Serperior, and Dragonite