New Weapons
Sora, Donald, and Goofy acquire new weapons as they go through the game -- Keychains for Sora, Shields for Goofy, and Rods for Donald.
Some you get as you progress naturally through the game and some require some special tasks to be completed.
Also, go back to the Item Shop in Traverse Town now and again to see the nephews' new stock. Here's where to find what:
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Sora -- Keychains
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Kingdom Key: Default.
Jungle King: Clear Deep Jungle.
Three Wishes: Clear Agrabah.
Crabclaw: Clear Atlantica.
Pumpkinhead: Clear Halloweentown.
Fairy Harp: Clear Neverland.
Wishing Star: Go back to Traverse Town after clearing Monstro and see Geppetto at his shop in District 1.
Spellbinder: See Merlin after acquiring Fire, Thunder, and Blizzard.
Metal Chocobo: Beat Cloud in the Hercules Cup.
Olympia: Beat Phil, Pegasus, and Hercules Cups.
Divine Rose: Seal Hollow Bastion and see Belle in the Library.
Oathkeeper: Talk to Kairi in the Secret Waterway after the first trip to Hollow Bastion.
Oblivion: In the Grand Hall in Hollow Bastion, during the second trip.
Lionheart: Beat Leon and Cloud in the Hades Cups.
Ultima Weapon: Synthesize at the Item Shop.
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Goofy -- Shields
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Knight's Shield: Default.
Stout Shield: For sale at the Item Shop in Traverse Town.
Smasher: For sale at the Item Shop in Traverse Town.
Mythril Shield: For sale at the Item Shop in Traverse Town.
Gigas Fist: For sale at the Item Shop in Traverse Town.
Golem Shield: For sale at the Item Shop in Traverse Town.
Onyx Shield: For sale at the Item Shop in Traverse Town.
Adamant Shield: For sale at the Item Shop in Traverse Town.
Herc's Shield: Beat the Hercules Cup.
Genji Shield: Beat Yuffie in the Hades Cup.
Defender: A rare item dropped by Defenders in Hollow Bastion.
Save the King: Beat the Hades Cup time attack.
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Donald -- Rods
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Mage's Staff: Default
Morning Star: For sale at the Item Shop in Traverse Town.
Warhammer: For sale at the Item Shop in Traverse Town.
Shooting Star: For sale at the Item Shop in Traverse Town.
Magus Staff: For sale at the Item Shop in Traverse Town.
Silver Mallet: For sale at the Item Shop in Traverse Town.
Grand Mallet: For sale at the Item Shop in Traverse Town.
Wisdom Staff: For sale at the Item Shop in Traverse Town.
Lord Fortune: Get every summon and visit the Fairy Godmother.
Violetta: White Trinity in Olympus Coliseum.
Wizard's Relic: A rare item dropped by Wizards in Hollow Bastion.
Dream Rod: Acquire every spell and visit Merlin.
Save the Queen: Beat the Hades Cup solo