This fish is useable as offensive scarf/ band pokemon because of the abilities and decent stats.

•Wave Crash : Powerful STAB move that can deal huge damage to the opp. Be careful about the recoil tho.
•Psychic Fangs : Reliable STAB move that got boosted by strong jaw and can break screens.
•Flip turn : Huge for choice item pokemons, this allow Bruxish to pivot and gain momentum.
•Ice Fangs/Crunch : Nice option for other Psychic-type/Ghost-type (Crunch). Nice option for Salamence, Dragonite, and other 2x/4x ice weak pokemons.

Abilities
•Dazzling : use this so Bruxish cannot be killed/attacked by priority moves.
•Strong Jaw : Use this so Bruxish can deal HUGE damage output.

Items
•Choice band : for more DMG outpot of course.
•Choice scarf : for more speed so it can outspeed things.

Note : DONT leave the fish against priority moves if you use Strong jaw and treat this pokemon like other choice item pokemons.