Galarian Articuno's signature move is a special psychic-type move that has a chance to freeze enemies.
Galarian Zapdos's signature move is a physical fighting-type move that can lower enemy defense.
Galarian Moltres's signature move is a special dark-type move that has a chance to flinch enemies.
Regidraco's signature move is a dragon-type move that has greater power the more HP Regidraco has.
Regieleki's signature move is a special electric-type move that traps enemies in an electric barrier for 4-5 turns.
Galarian Slowbro's signature move is a special poison-type move that attacks the lower stat between the opponent's DEF and SpD and can poison enemies.
Gigantamax Blastoise's G-Max move deals damage and continously attacks the enemy for 4 turns if the enemy is a non-water type.
Gigantamax Venusaur's G-Max move deals damage and continously attacks the enemy for 4 turns if the enemy is a non-grass type.
Siggu I have answers for you here.