Instructions
Travel to Figaro Castle, which is in the middle of the northwestern deserts. Just south of the throne room is a clerk who sells several machines, including the bio blaster, debilitator, drill and flash.
Go to your airship and speak with the clerk to rearrange your party. Put Locke in your group. As a thief, he's the only character in the game who can steal the remaining machines.
Fly into Kefka's Tower, which is in the middle of the world map. Wander around until you have a random battle with a Scullion, Junk or Dueller.
Select "Steal" during Locke's turn. If you miss, try again the following turn. Each enemy has a unique machine, including the air anchor, noise blaster and chainsaw.