I've done almost everything now. I still have to add "Card Mod From", but it's close. If you see any content errors, or any missing things, please tell me.
Final Fantasy VIII Weapons Guide

Squall Leonhart:
Revolver (Starting Weapon):
Cost: 100gil
Atk: 11
Hit: 255%
Rough Divide
Items Needed:
M-Stone Piece (x2)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhemel, Blobra, T-Rexaur, Bomb, Vysage, Lefty, Righty, Elastoid, Gesper, Blitz, Death Claw, Abyss Worm, Gayle, Armadodo
Stolen From: Bite Bug, Blobra, Buel

Screw (x2)
Dropped by: Geezard
Stolen From: Geezard


Shear Trigger:
Cost: 200gil
Atk: 14
Hit: 255%
Rough Divide, Fated Circle
Items Needed:
Steel Pipe (x1)
Dropped by: Wendigo, GIM47N
Stolen From: Wendigo

Screw (x4)
Dropped by: Geezard
Stolen From: Geezard


Cutting Trigger:
Cost: 400gil
Atk: 18
Hit: 255%
Rough Divide, Fated Circle
Items Needed:
Mesmerize Blade (x1)
Dropped by: Mesmerize
Stolen From: Mesmerize

Screw (x8)
Dropped by: Geezard
Stolen From: Geezard


Flame Saber:
Cost: 600gil
Atk: 20
Hit: 255%
Rough Divide, Fated Circle, Blasting Zone
Items Needed:
Betrayal Sword (x1)
Dropped by: Forbidden
Stolen From: Blitz

Turtle Shell (x1)
Dropped by: Armadodo
Stolen From: Armadodo, Adamantoise

Screw (x4)
Dropped by: Geezard
Stolen from: Geezard


Twin Lance:
Cost: 800gil
Atk: 22
Hit: 255%
Rough Divide, Fated Circle, Blasting Zone
Items Needed:
Dino Bone (x1)
Dropped by: T-Rexaur
Stolen from: T-Rexaur

Red Fang (x1)
Dropped by: Hexadragon, Chimera
Stolen From: Hexadragon, Chimera

Screw (x12)
Dropped by: Geezard
Stolen From: Geezard


Punishment:
Cost:1000gil
Atk: 24
Hit: 255%
Rough Divide, Fated Circle, Blasting Zone
Items Needed:
Chef's Knife (x1)
Dropped by: Tonberry
Stolen From: Tonberry

Star Fragment (x2)
Dropped by: Iron Giant, T-Rexaur, Tri-Face, Chimera, Hexadragon, Red Dragon
Stolen From: Iron Giant

Turtle Shell (x1)
Dropped by: Armadodo
Stolen From: Armadodo, Adamantoise

Screw (x18)
Dropped by: Geezard
Stolen From: Geezard


Lion Heart:
Cost: 2000gil
Atk: 30
Hit: 255%
Rough Divide, Fated Circle, Blasting Zone, Lion Heart
Items Needed:
Adamantine (x1)
Dropped by: Adamantine
Stolen From: BGH251F2 (at FH)

Dragon Fang (x4)
Dropped by: Hexadragon, Blue Dragon
Stolen From: N/A

Pulse Ammo (x12)
Dropped by: N/A (Refine from Power Generator, dropped by Blitz)
Stolen From: N/A



Rinoa Heartily:
Pinwheel (Starting Weapon):
Cost: 100gil
Atk: 11
Hit: 99%
Items Needed:
M-Stone (x3)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhemel, Blobra, T-Rexaur, Bomb, Vysage, Lefty, Righty, Elastoid, Gesper, Blitz, Death Claw, Abyss Worm, Gayle, Armadodo.
Stolen From: Bite Bug, Blobra, Buel


Valkyrie:
Cost: 200gil
Atk: 14
Hit: 101%
Items Needed:
Shear Feather (x1)
Dropped by: Thrustaevis, Death Claw
Stolen From: Thrustaevis, Death Claw

Magic Stone (x1)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhelmel, Blobra, Geezard, Abyss Worm, Ochu
Stolen From: Grat, Buel, Jelleye


Rizing Sun:
Cost: 400gil
Atk: 18
Hit: 103%
Items Needed:
Saw Blade (x1)
Dropped by: Belhemel
Stolen From: Belhemel

Screw (x8)
Dropped by: Geezard
Stolen From: Geezard

Cardinal:
Cost: 800gil
Atk: 24
Hit: 104%
Items Needed:
Cockatrice Pinion (x1)
Dropped by: Cockatrice
Stolen From: Cockatrice

Mesmerize (x1)
Dropped by: Mesmerize
Stolen From: Mesmerize

Sharp Spike (x1)
Dropped by: Grand Mantis, Death Claw
Stolen From: Grand Mantis


Shooting Star:
Cost: 1000gil
Atk: 28
Hit: 107%
Items Needed:
Windmill (x2)
Dropped by: Thrustaevis, Abyss Worm, Death Claw
Stolen From: Thrustaevis, Abyss Worm

Regan Ring (x1)
Dropped by: Torama, Chimera, Turtapod, Mesmerize, Lefty
Stolen From: Torama, Biggs (2nd fight)

Force Armlet (x1)
Dropped by: Ochu, Forbidden, Edea (2nd Fight)
Stolen From: N/A

Energy Crystal (x2)
Dropped by: Elnoyle, Behemoth, Red Dragon
Stolen From: N/A



Quistis Trepe:
Chain Whip (Starting Weapon):
Cost: 100gil
Atk: 12
Hit: 103%
Items Needed:
M-Stone Piece (x2)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhemel, Blobra, T-Rexaur, Bomb, Vysage, Lefty, Righty, Elastoid, Gesper, Blitz, Death Claw, Abyss Worm, Gayle, Armadodo.
Stolen From: Bite Bug, Blobra, Buel

Spider Web (x1)
Dropped by:Caterchipillar
Stolen From: Caterchipillar


Slaying Tail:
Cost: 200gil
Atk: 15
Hit: 104%
Items Needed:
Magic Stone (x2)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhelmel, Blobra, Geezard, Abyss Worm, Ochu
Stolen From: Grat, Buel, Jelleye

Sharp Spike (x1)
Dropped by: Grand Mantis, Death Claw
Stolen From: Grand Mantsi


Red Scorpion:
Cost:400gil
Atk: 20
Hit: 105%
Items Needed:
Ochu Tentacle (x2)
Dropped by: Ochu
Stolen From: Ochu

Dragon Skin (x2)
Dropped by: Anacondaur, Blue Dragon
Stolen From: N/A


Save the Queen:
Cost: 800gil
Atk: 25
Hit: 107%
Items needed:
Malboro Tentacle (x2)
Dropped by: Marlboro
Stolen From: Marlboro

Sharp Spike (x4)
Dropped by: Grand Mantis, Death Claw
Stolen From: Grand Mantis

Energy Crystal (x4)
Dropped by: Elnoyle, Behemoth, Red Dragon
Stolen From: N/A



Zell Dincht:
Metal Knuckle (Starting Weapon):
Cost: 100gil
Atk: 12
Hit: 98%
Items Needed:
Fish Fin (x1)
Dropped by: Fastitocalon-F, Fastitocalon
Stolen From: Fastitocalon-F

M-Stone Piece (x4)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhemel, Blobra, T-Rexaur, Bomb, Vysage, Lefty, Righty, Elastoid, Gesper, Blitz, Death Claw, Abyss Worm, Gayle, Armadodo
Stolen From: Bite Bug, Blobra, Buel


Maverick:
Cost: 200gil
Atk: 15
Hit: 99%
Items Needed:
Dragon Fin (x1)
Dropped by: SAM08G, Grendel
Stolen From: Grendel

Spider Web (x1)
Dropped by: Caterchipillar
Stolen From: Caterchipillar


Gauntlet:
Cost: 400gil
Atk: 20
Hit: 101%
Items Needed:
Dragon Skin (x1)
Dropped by: Anacondaur, Blue Dragon, Grendel
Stolen From: N/A

Fury Fragement (x1)
Dropped by: Red Dragon, Blue Dragon, Grendel
Stolen From: Blue Dragon


Ehrgeiz:
Cost: 800gil
Atk: 25
Hit: 103%
Items Needed:
Adamantine (x1)
Dropped by: Adamantine
Stolen From: BGH251F2 (at FH)

Dragon Skin (x4)
Dropped by: Anacondaur, Blue Dragon
Stolen From: N/A

Fury Fragment (x1)
Dropped by: Red Dragon, Blue Dragon, Grendel
Stolen From: Blue Dragon



Selphie Tilmitt:
Flail (Starting Weapon):
Cost: 100gil
Atk: 12
Hit: 98%
Items Needed:
M-Stone Piece (x2)
Dropped by: Bite Bug, Funguar, Buel, Jelleye, Glacial Eye, Creeps, Belhemel, Blobra, T-Rexaur, Bomb, Vysage, Lefty, Righty, Elastoid, Gesper, Blitz, Death Claw, Abyss Worm, Gayle, Armadodo
Stolen From: Bite Bug, Blobra, Buel

Bomb Fragment (x1)
Dropped by: Bomb
Stolen From: Bomb


Morning Star:
Cost: 200gil
Atk:15
Hit: 99%
Items Needed:
Steel Orb (x2)
Dropped by: Wendigo, GIM47N
Stolen From: Wendigo

Sharp Spike (x2)
Dropped by: Grand Mantis, Death Claw
Stolen From: Grand Mantis


Crescent Wish:
Cost: 400gil
Atk: 20
Hit: 100%
Items Needed:
Inferno Fang (x1)
Dropped by: Red Dragon
Stolen From: Red Dragon

Life Ring (x1)
Dropped by: Turtapod, Torama, Mesmerize
Stolen From: N/A

Sharp Spike (x4)
Dropped by: Grand Mantis, Death Claw
Stolen From: Grand Mantis


Strange Vision:
Cost: 200gil
Atk: 25
Hit: 255%
Items Needed:
Adamantine (x1)
Dropped by: Adamantine
Stolen From: BGH251F2 (at FH)

Star Fragment (x3)
Dropped by:Iron Giant, T-Rexaur, Tri-Face, Chimera, Hexadragon, Red Dragon
Stolen From: Iron Giant

Curse Spike (x2)
Dropped by: Creeps, Marlboro, Forbidden, Grand Mantis, Tri-Face
Stolen From: Tri-Face



Irvine Kinneas:
Valiant (Starting Weapon):
Cost: 100gil
Atk: 12
Hit: 105%
Items Needed:
Steel Pipe (x1)
Dropped by: Wendigo, GIM47N
Stolen From: Wendigo

Screw (x4)
Dropped by: Geezard
Stolen From: Geezard

Ulysses:
Cost: 200gil
Atk: 15
Hit: 108%
Items Needed:
Steel Pipe (x1)
Dropped by: Wendigo, GIM47N
Stolen From: Wendigo

Bomb Fragment (x1)
Dropped by: Bomb
Stolen From: Bomb

Screw (x2)
Dropped by: Geezard
Stolen From: Geezard


Bismark:
Cost: 400gil
Atk: 20
Hit: 110%
Items Needed:
Steel Pipe (x1)
Dropped by: Wndigo, GIM47N
Stolen From: Wendigo

Dynamo Stone (x4)
Dropped by: Blitz
Stolen From: Elastoid

Screw (x8)
Dropped by: Geezard
Stolen From: Geezard

Exeter:
Cost: 800gil
Atk: 25
Hit: 115%
Items Needed:
Dino Bone (x1)
Dropped by: T-Rexaur
Stolen From: T-Rexaur

Moon stone (x1)
Dropped by: Elnoyle, Imp, Torama
Stolen From: Elnoyle

Star Fragment (x1)
Dropped by: Iron Giant, T-Rexaur, Tri-Face, Chimera, Hexadragon, Red Dragon
Stolen From: Iron Giant

Screw (x18)
Dropped by: Geezard
Stolen From: Geezard

Great Job FF_Fanatic ;)

not a bad job the only things youve forgotten are
for pulse ammo you could refine energy crystal's and the laser cannon mugged from mobile type 8 in disc 3

3 iron giants refined gives you a star fragment

the minatour card give you ten Adamantine

it easy to have the lionheart in disc one as long as your good at the card game and have card mod

I haven't put the Card Mods in yet. I know how to get the info. I'm just kinda lazy right now.