Freddie the Traitor - Borderlands 3 Farming Guides
Location: VIP Tower in The Handsome Jackpot
Part of: All Bets Off Story Mission
Drops: AutoAimè (Dahl Sniper)
Freddie the Traitor is one of the last bosses that you will fight during the Moxxi's Heist DLC. You'll find Freddie the Traitor in the VIP Tower of The Handsome Jackpot. To fight him a second time you'll have to clear the entire room of Loaders before Freddie spawns with his named Loader companions.
As far as loot goes, AutoAimè (Dahl Sniper) is the only item that is on his dedicated drops loot list. This item is not unique to Freddie, however, and can be found elsewhere in this DLC too.