Trainers who encounter and defeat Origin Forme Dialga in a Raid Battle have a chance to catch one that knows the Charged Attack Roar of Time.*
Trainers can activate the Adventure Effect associated with Roar of Time by using 5,000 Stardust and 5 Dialga Candy, distorting time for 6 minutes and pausing the timer of the following items: Incense, Daily Adventure Incense, Lucky Eggs, and Star Pieces.
You can extend the timer for Roar of Time’s Adventure Effect in increments of 6 minutes by using more Stardust and Dialga Candy. The timer can be extended up to two hours each time you tap Use, and you can tap Use again to add additional time—up to 24 hours total!
Once Roar of Time ends, the timer on any active items will continue to count down. Roar of Time cannot be active at the same time as any other Adventure Effect.