What does Gachapus's ultimate ability do?

Jackpot is the state Gachapus's whole kit is built around, and normally you do not decide when it happens. Bubbles fill the gacha slots one at a time, one per landed basic attack or skill use, and the state opens either when five bubbles of the same colour line up or when a gold bubble shows up. A bubble attack has a 1% chance of spawning that gold bubble. The rest of the kit runs on the same randomized logic, so the strongest thing Gachapus does is usually something you wait for rather than something you plan.

The ultimate, Super Jackpot, is the answer to that. It puts Gachapus into Jackpot status for 10 seconds, and for those 10 seconds basic attack damage goes up by 60%. That turns the character's payoff into a cooldown you can time against a boss window instead of a roll you hope lands.

One thing to know before you press it: while Jackpot is running, attacks stop adding to the gacha slots and fire Rainbow Bubbles instead. Your slot progress does not advance during the burst, so anything you had banked toward a natural five-of-a-colour is still sitting there when the 10 seconds end, and nothing new has been added to it.

Playing around the guarantee

Because the ultimate hands you the state outright, the random route is best treated as a bonus rather than a plan. If a gold bubble happens to appear on its own, that is free uptime you did not spend a charge on, and it works exactly the same way the ultimate's version does. Five matching colours does the same.

The practical pattern is to keep attacking to feed the slots between bursts, then spend the ultimate when you actually need the 60%, rather than the moment it comes up. Damage that lands inside Jackpot is worth more than damage outside it.

Not settled: What happens if you fire the ultimate while Jackpot is already running, whether the 10 seconds refresh or simply overwrite, is not settled, and neither is the ultimate charge cost.