Standarth specialized setup
Nature: Adamant
Ability: Weak armor
Item: Life orb/Focus sash
EV: 252 Attack, 252 Speed, 4 defense
Tera type: Fire
Moves:
Swords dance
Flare blitz
Phantom force/Shadow sneak
Close combat/Shadow sneak
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The point here is making the most of Ceruledge innate stats, moves combination and his hidden ability, to do what he usualy does better.
By standarth use Life orb because it pair well with his strong moves to maximize the damage output, if you think your opponents will be faster than you and not given you the chance to attack them, choose focus sash as a conter for that. With this you should be able to beat your opponent fairly easy and minimize the chance of leaving openings that he can use to do something that can benefit him in battle.
If your opponent is giving you an opening (like using status moves on the wrong situation, using weak moves that you can easily withstand, trading pokémon or the alike) use this moment to buff yourself with sword dances to maximize your damage output and facilitate your role. If your opponent happened to use an physical move and you withstand it, you have yourself in a sweet spot where you get a boost to damage and speed and can easily defeat them attacking first and beating them in one hit in most situations.
By standarth use Close combat or phantom force, but if you think you will face specific opponents that will not give you the chance to attack them or can attack you first and defeat you in one hit and focus sash is not enought, use shadow sneak to deal with this.
Also Phantom force should be used in situations where you know that a two-turn move won't be a problem and the damage will be worthy, otherwise use Flarez blitz, Close combat, Shadow sneak.