Focus Sash lets it survive an opposing attack while a build aiming to deploy Trick Room and attack from above as an ace—this is the goal of this Hatterene build. Its ability Magic Bounce reflects opposing status moves, allowing it to establish the desired field state reliably without being disrupted.

Alternative Move Options

Misty Explosion to pass to a teammate is an option

Mystical Fire gives Steel coverage and raises breaking power, making it a move that improves Hatterene's ability to break through foes.Misty Explosion lets Hatterene knock itself out against foes that would take two or more turns to break, handing the battle over to a teammate. Choose according to your team composition.

Sash Trick Room Role

Focus Sash and Magic Bounce work together to guarantee it a chance to act, making it a special attacker breaking opponents under Trick Room. In addition to its STAB moves, it carries Mystical Fire for Steel types, allowing it to pressure a wide range of foes on its own.

Threats

Weak to priority users

Priority works even in Trick Room, risking KO right after deployment. Also, Trick Room lasts only five turns, so beware of foes stalling with recovery moves or switches until it expires before you can finish them off.

Trick Room by itself, Life Orb it overwhelms opponents with power-boosted spread moves — a special attacker build. Its Ability Magic Bounce, lets it set up without being disrupted by the opponent's status moves like Taunt — is its strength.

Alternative Move Options

Mystical Fire is also a good option

Protect instead, Mystical Fire are also recommended. Mystical Fire hits the weakness of Steel-type Pokémon, who resist both Psychic- and Fairy-type moves.

Doubles Trick Room Attacker Role

Trick Roomit sets up Trick Room and, leveraging its low Speed, launches priority attacks — that's its main role.Protect to block focused attacks from the opponent, while chipping away at the whole opposing team with support from the ally beside it.

Good Partners

Indeedee with Psychic Surge

the ability Psychic Surge with サイコフィールド状態, which can set up Psychic Terrain, has good synergy with it. While Psychic Terrain is active, Expanding Force becomes a powerful spread move.

Threats

Steel-type Pokémon

Steel-type Pokémon exploit its weakness and also resist both Psychic- and Fairy-type moves. Against Pokémon it struggles with, block their moves with Protect or by switching out, while countering with your ally's moves. Also, with Mystical Fire you can also exploit its weakness as a counter.