Pokemon Ultra Sun V12 Cia Exclusive -

The base shiny rate is increased from 1/4096 to 1/1024 (without Shiny Charm). Additionally, SOS battles now cap at a 50% shiny boost after 50 calls, making chaining viable but not trivial. The “Exclusive” part also adds a purchasable Shiny Charm for $500,000 at the Heahea City Pokémon Center—available immediately after the first trial.

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Why does this have to be a CIA file and not a standard patch? The base shiny rate is increased from 1/4096

This is where the "exclusive" part gets serious. Most ROM hacks give you an .ips or .3ds file to patch over your legally dumped cartridge. This is where the "exclusive" part gets serious

Not v12.

The creator compiled this hack directly into a pre-patched .CIA format because of the custom assets. v12 changes the game’s memory allocation. It adds custom battle backgrounds ripped from Pokémon Battle Revolution and restores the "Vs. Seeker" item into the bottom screen.

Trying to patch a standard ROM with the v12 script results in a red screen crash 90% of the time. To experience the "Exclusive" v12, you must install the raw CIA via custom firmware (CFW).