How do you raise attack with power bracer?

To raise your Pokémon's Attack stat using a Power Bracer, you need to equip the item on the Pokémon you wish to train. When the Pokémon gains experience points in battles, it will receive an additional 4 Effort Values (EVs) in Attack for each battle it participates in. To maximize the training effect, focus on defeating Pokémon that yield Attack EVs, and ensure the Pokémon is actively battling rather than just being in the party. After accumulating enough EVs, you can check the Pokémon's stats to see the increase in Attack.