Bronze Brick

The Bronze Brick is a little brown brick in a necklace received from the player's in-game parents shortly before they get abducted by Team Eclipse. It is the main item of this game and is a very significant part of the story. It is the reason why the original game was called Pokémon Brick Bronze.

Mitis Town
After the player has chosen their Starter Pokémon - and fought Rival Anthony in their first Pokémon battle inside the Mitis Town Pokemon Lab - the player's in-game parents give them the Bronze Brick in the form of a necklace. However, they do not reveal the true power of this little brick, saying only that it is a gift for the player to always remember them, and that they must keep it safe.

Soon afterwards, the player's parents are abducted by Team Eclipse. Anthony urgently calls the player back home, where Zak reveals the situation and asks if the player's parents mentioned anything about the work they were doing. The player informs the Professor about the necklace. Zak then tells the player it might be better if they left town, and head for Cheshma Town.

Cheshma Town & Gale Forest
Upon entry to Cheshma Town, a young woman calls out to the player and says she has some information about Team Eclipse. She leads the player to her house and they discuss the abduction. The player again mentions the necklace. The girl asks to see it, and says that l says look old... and valuable.

She runs out of the house, stealing the necklace. The player will eventually confront her in a dead-end inside Gale Forest, where she reveals herself to be...!?

Anthian Park
When the player defeats the Eclipse Boss in Anthian Park, explosives detonate and Anthian City is to on course for destruction. Suddenly the Bronze Brick starts glowing, summoning Legendary Pokémon Dialga and Palkia. They stabilize the city while taking the player and Rival Teresa back to a time before the bombs were planted, so they can stop Eclipse Admin Tyler from setting the explosives.

After Teresa and the player dispose of the bombs, Gerald tells them the tale of the Mythical Pokémon Hoopa. He mentions there is a key to its tomb and Teresa asks what the key looks like. Gerald mentions some different theories, one of which his that the key could be a small Brick. The player and Teresa instantly figure out that the Bronze Brick on the player's necklace is the same one from the legend and is the key for Hoopa's tomb.

And if that is the case, then no doubt Team Eclipse will soon be after them in order to get it...

Demon's Tomb
Once the player has reached Demon's Tomb, Eclipse Boss Zak reveals that he knew the player was holding onto the brick ever since their encounter with Eclipse Member Linda. He also gloats that it was his plan for the player to come to the Tomb. The brick then flies out of the player's hands and onto Team Eclipse's portal structure, completing it and unsealing Hoopa!

After the battle is finished, the player picks the Brick back up. The Bronze Brick "will trust the player" to be its protector.

Trivia

 * The original Pokémon Brick Bronze Logo features Hoopa Unbound next to the Pokémon Brick Bronze title made of Bronze Bricks.