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I can't say where I get my information, so take it with as little of a grain of salt as you want.
The following are the start dates of the events for Diancie, Volcanion, and Hoopa.
-Volcanion: March 26th
-Diancie: May 14th
-Hoopa: July 21st
-Having all three unlocks an event where the doors to the other power plants open up. Inside one of them is the M-Lati@s stone. Inside the others are signature hold items that boost Yveltal and Xerneas.
The following are the start dates of the events for Diancie, Volcanion, and Hoopa.
-Volcanion: March 26th
-Diancie: May 14th
-Hoopa: July 21st
-Having all three unlocks an event where the doors to the other power plants open up. Inside one of them is the M-Lati@s stone. Inside the others are signature hold items that boost Yveltal and Xerneas.
