Lightning

Lightning (とどろく), also translated as Thunder in Kingdom Hearts, is a material type available in Kingdom Hearts, Kingdom Hearts II, and Kingdom Hearts 358/2 Days. Lightning materials contain the essence of thunder, and are colored yellow.

Kingdom Hearts

 * Thunder Shard: Yellow Opera (8%), White Mushroom (100%), Bambi (40%/60%)
 * Thunder Gem: Aquatank (8%), Screwdiver (4%), White Mushroom (10%/40%), Bambi (30%)

Kingdom Hearts Final Mix introduced the Lightning Stone, dropped only by the Black Ballade.

Kingdom Hearts II

 * Lightning Shard : Bolt Tower (10%), Rapid Thruster (4%)
 * Lightning Stone : Driller Mole (6%), Emerald Blues (10%)
 * Lightning Gem : Armored Knight (12%), Surveillance Robot (8%)
 * Lightning Crystal: Devastator (4%), Strafer (6%)

Kingdom Hearts 358/2 Days

 * Lightning Shard: Poison Plant (Missions 44, 59), Bully Dog (Missions 38, 49, 50), Neoshadow (Mission 38, 44), Jumbo Cannon (Missions 39, 46, 61), Hover Ghost (Missions 36, 45), Lurk Lizard (Mission 47)
 * Lightning Gem: Loudmouth (Mission 68), Solid Armor (Mission 68), Hover Ghost (Missions 52, 62), Dual Blade (Mission 54)
 * Lightning Crystal: Possessor (Mission 83, 89), Hover Ghost (Mission 79), Blitz Spear (Mission 83)

Kingdom Hearts 358/2 Days

 * Lightning Shard: Outside in Mission 36, Vestibule in Mission 39, Vestibule in Mission 46, eastern rock cliff in Mission 53, Outside in Mission 61; open at least 80 chests and talk to Axel on Day 94.
 * Lightning Gem: Outside in Mission 61.
 * Lightning Crystal: Southeast island on South Map in Mission 77, Boneyard 1 in Mission 79, Town Square in 87.

Kingdom Hearts 358/2 Days

 * Lightning Shard: Clear Bonus for Missions 36, 40, 43, 47, 48, 59, and 82; Random Bonus for Missions 36, 39, 40, 41, 46, and 61.
 * Lightning Gem: Clear Bonus for Missions 67, 82, and 72; Random Bonus for Mission 61.
 * Lightning Crystal: Clear Bonus for Missions 73, 74, and 87; Random Bonus for Missions 79 and 88.

Synthesized items
Lightning materials are used to synthesize the following items:

Kingdom Hearts

 * Elixir (2 Thunder Shards)
 * Guard Earring (1 Thunder Shard)
 * Mega-Potion (1 Thunder Gem)
 * Magic Armlet (3 Thunder Shards)
 * Mega-Ether (3 Thunder Gems)
 * Rune Armlet (2 Thunder Gems)
 * Three Stars (3 Thunder Shards)
 * Ribbon (5 Thunder Gems)
 * Ultima Weapon (5 Thunder Gems)
 * Moogle Badge (1 Thunder Shard)
 * (Final Mix only)

Kingdom Hearts II

 * Acrisius (1 Lightning Stone)
 * Acrisius+ (1 Lightning Stone)
 * Thundaga Trinket (1 Lightning Shard, 1 Lightning Stone)
 * Thundagun Trinket (1 Lightning Shard, 1 Lightning Stone)
 * Mage Earring (1 Lightning Gem)
 * Slayer Earring (1 Lightning Gem)
 * Drive Recovery (1 Lightning Shard)
 * High Drive Recovery (1 Lightning Shard)
 * Defense Boost (3 Lightning Crystals)
 * Power Boost (3 Lightning Crystals)

Kingdom Hearts 358/2 Days

 * Thunder (2 Lightning Shards)
 * Thundara (2 Lightning Gems)
 * Thundaga (2 Lighning Crystals)
 * Thunder Charm (2 Lightning Gems)
 * Thunder Block L (3 Lightning Gems)
 * Stolen Thunder (2 Lightning Crystals, 5 Lightning Shards)

Notes and References
Grondant