List Of Kingdom Hearts Weapons For Sora

Kingdom Key √

Recieved right before fighting Darkside on Destiny Islands.

Jungle King √

Seal keyhole in Deep Jungle.

Three Wishes √

Seal keyhole in Agrabah.

Metal Chocobo

Defeat Cloud in Hercules Cup.

Olympia

Win Phil, Pegasus, and Hercules Cups.

Lionheart

Beat Cloud and Leon in the Hades Cup.

Spellbinder √

Speak to Merlin after aquiring all bottom-level magic skills

Crabclaw

Seal keyhole in Atlantica.

Lady Luck

White Trinity Mark in Wonderland.

Pumpkinhead

Seal keyhole in Halloween Town.

Divine Rose

Speak to Belle in Hollow Bastion Library.

Fairy Harp

Seal keyhole in Neverland.

Oathkeeper

Speak to Kairi in Secret Waterway in Traverse Town.

Wishing Star √

In Gepetto's House in Traverse Town.

Oblivion

In Chest in Hollow Bastion's Grand Hall.

Ultima Weapon

The Ultimate Weapon. Make at Item Workshop in 2nd Floor Accesory Shop.

One Winged Angel

Defeat Sephorith in Coliseum.

Diamond Dust

Defeat Ice Titan in Coliseum Hercules Cup Tornament.

Thanks Adventurejimbob and CL_Florida Oranges!

Actually if you are looking for sora's weapons. You obtain most of them after you lock places

Kingdom Key: Default weapon
Jungle King: Lock the Deep Jungle
Three Wishes: Lock Agrabah
Crabclaw: Lock Atlantica
Fairy Harp: Lock Neverland
Pumpkin King: Lock HalloweenTown
Wishing Star: Visit Geppetto after completing Monstro.
Spellbinder: Attain all Lv. 1 magic spells. Speak to Merlin.
Olympia: Win all tournaments
Metal Chocobo: Defeat Cloud in Hercules Cup
Lionheart: Defeat Cloud and Leon in Hades Cup.
Lady Luck: Use White Trinity in Wonderland.
Divine Rose: Speak to Belle after defeating Maleficent.
Oathkeeper: Make promise with Kairi in the Forbidden Waterway.
Oblivion: Chest in the Hallow Bastion.
Ultima Weapon: Synethsize all 24 items, then synthesize weapon.
One-Winged Angel: Defeat Sephiroth in Platinum Match.
Diamond Dust: Defeat the Ice Titan in the Gold Match.

Hope this helps,
~Oranges