Gil bonus abilities

Gillionaire, also known as Millionaire, is a recurring ability in the series that doubles the amount of Gil a player earns from battles.

Final Fantasy VII
The ability can be found on the Gil Plus materia. Due to a bug in the game, Level 1 will never produce the 1.5x amount that it's supposed to, and will always double the amount of Gil earned from battles as though it were Mastered. The ability is not stackable.

Final Fantasy IX
Millionaire is an ability that is exclusive to Quina and doubles the amount of Gil earned after battle. It can be learned only from Yellow Scarf.

Final Fantasy X
Gillionaire is an ability that can be found or Customized onto an weapon. It requires using 30 Designer Wallets to customize.

Final Fantasy X-2
Gillionaire is an ability found on the Lady Luck Dressphere. It takes 100 AP to learn, and can only be learned after mastering Double EXP. It can also be accessed via the Horn of Plenty Garment Grid by passing through the red gate on the grid. The ability is stackable in this game.