Quote Originally Posted by rubah
Don't equip rare item.
Do mug them.
Power Generators are never dropped. The only way to get one from a Blitz is to Mug it when it is at a high level (30+, use Tonberry's Lv Up if necessary) without Rare Item equipped.

If you do equip Rare Item and attempt to Mug you'll be reducing your chances of getting a Power Generator to 0%.