this is what im think
Best equipment and its location:

Sword: Nagra Rock - In the back of Nelveska Temple or poachorky
Knight Sword: chaos blade- Last battle of Deep Dungeon
Bow: Perseus Bow - 8th battle of Deep Dungeon
Crossbow: Gastrafitis - Shop
Knive: Zorlin Shape - Poach a Plague
Stick: Whale Whisker - Poach: Tiamat
Hammer: Scorpion Tail - Poach: Hyundra
Axe: Slasher - Shop
Katana: Chirijraden - Last battle of Deep Dungeon
Ninja Sword: Kogo Knife - 7th battle of Deep Dungeon
Gun: Blast Gun - 6th battle of Deep Dungeon
Spear: Javelin II - Right podium of Nelveska Temple
Staff: Sage Staff - 7th battle of Deep Dungeon
Rod: Faith Rod - 4th battle of Deep Dungeon
Book: Madlemgen - Poach: Great Morbol
Harp: Fairy Harp - 4th battle of Deep Dungeon or poach: Treant
Fabric: Ryozan Silk - Poach: Tiamat
Bag: FS Bag - Poach: Wild Boar
Shield: Escutcheon II - Left podium of Nelveska Temple
Helmet: Grand Helmet - 9th battle of Deep Dungeon
Hat: Thief Hat - Shop
Ribbon: Ribbon - Poach: Wild Boar
Armor: Maximillion - 9th battle of Deep Dungeon
Robe: Robe of Lords - 8th battle of Deep Dungeon
Cloth: Rubber Conscious - Poach: Hydra
Gauntlet: Genji Guantlet - Steal: Elmdor
Ring: Angel Ring - Shop
Mantle: Vanish Mantle - Gemineas Peak
Perfume: Chantage - Poach: Porky