AP Boost

AP Boost, also called AP Up, is an item that can be obtained in the  series. AP Boosts will permanently increase a character's overall by one. This item can only be used from the items menu after it is obtained.

Kingdom Hearts II Final Mix

 * AP Boost: Demyx's Replica Data, Luxord's Replica Data

Kingdom Hearts

 * AP Up: Complete the Phil Cup in under three minutes; complete the Green Serpent course of Jungle Slider; deliver the fourth Rare Nut to Owl; two chests at the Clock Tower; chest at Tigger's Giant Pot; chest at the Library; chest at the World Terminus.

Kingdom Hearts Final Mix

 * AP Up: Complete the Splash Tunnel course of Jungle Slider; deliver the ninth Postcard; deliver the fourth Rare Nut to Owl; Yellow Trinity Mark at the Mystical House; two chests at the Clock Tower; chest at Tigger's Giant Pot; chest at the Library; chest at the World Terminus.

Kingdom Hearts II

 * AP Boost: Obtain 25 material types; obtain all Mythril materials; chest at the Tram Common; chest at the Underground Concourse; chest at the Sunset Terrace; chest at the Borough; chest at the Postern; chest at the Corridors; chest at the Restoration Site; chest at the Crystal Fissure; reward for completing all of Li Shang's missions; chest at the Village Cave; chest at the Ridge; two chests at the Throne Room; chest at the ; chest at The West Hall; chest at the ; chest at the Cave of the Dead: Passage; chest at the Underworld Caverns: Entrance; chest at the Underworld Caverns: Atrium; chest at The Lock; chest at Pooh's House; chest at Piglet's House; chest at Rabbit's House; two chests at The Spooky Cave; chest at the ; chest at the Waterway; chest at the Town; two chests at Isla de Muerta: Powder Store; chest at Agrabah; chest at the Bazaar; chest at the The Cave of Wonders: Valley of Stone; chest at the Hinterlands; chest at Santa's House; chest at the Elephant Graveyard; chest at the Wildebeest Valley; chest at the Oasis; chest at the I/O Tower: Hallway; chest at the Central Computer Mesa; chest at Fragment Crossing; chest at Memory's Skyscraper; chest at Ruin and Creation's Passage.

Kingdom Hearts II Final Mix

 * AP Boost: Obtain 25 material types; obtain all Mythril materials; chest at the Tram Common; chest at the Underground Concourse; chest at the Sunset Terrace; chest at the Borough; chest at the Postern; chest at the Corridors; chest at the Restoration Site; chest at the Crystal Fissure; two chests at the Depths; chest at the Mining Area; chest at the Engine Chamber; two chests at the Mineshaft; reward for completing all of Li Shang's missions; chest at the Village Cave; chest at the Ridge; two chests at the Throne Room; chest at the ; chest at The West Hall; chest at the ; chest at the Cave of the Dead: Passage; chest at the Underworld Caverns: Entrance; chest at the Underworld Caverns: Atrium; chest at The Lock; chest at Pooh's House; chest at Piglet's House; chest at Rabbit's House; two chests at The Spooky Cave; chest at the ; chest at the Waterway; chest at the Town; two chests at Isla de Muerta: Powder Store; chest at Agrabah; chest at the Bazaar; chest at the The Cave of Wonders: Valley of Stone; chest at the Hinterlands; chest at Santa's House; chest at the Elephant Graveyard; chest at the Wildebeest Valley; chest at the Oasis; chest at the I/O Tower: Hallway; chest at the Central Computer Mesa; chest at Fragment Crossing; chest at Memory's Skyscraper; chest at Ruin and Creation's Passage.

Kingdom Hearts III

 * AP Boost: Photograph a Lucky Emblem for the first time; chest in The Woods.

Kingdom Hearts Final Mix

 * AP Up: In Beginner Mode, Sora starts off with 4 AP Ups in stock.

Kingdom Hearts
AP Up can be synthesized once the second list is unlocked.
 * Spirit Shard x3
 * Spirit Gem x2
 * Mythril x3

Kingdom Hearts Final Mix
AP Up can be synthesized once the third list is unlocked.
 * Blaze Gem x 2
 * Frost Gem x 2
 * Thunder Gem x 2
 * Mythril x 4

Kingdom Hearts II
The Skill Recipe can be found in a chest in Ansem's Study. The AP Boost is a rank synthesis item, and its upgrade is the Magic Boost recipe.
 * 1 Mythril Gem
 * 3 Power Crystal
 * 3 Dark Crystal
 * 3 Frost Crystal