It's just another day, another datamine for Pokémon Go, now that the fusion mechanic for upcoming forms of Necrzoma has apparently leaked.
COMPLETE GUIDE to FUSIONS in Pokemon GO!
The datamine, found via an APK mine and posted on Reddit, reveals how fusion works and what happens when Necrozma fuses with Solgaleo and Lunala.
By seemingly pressing a big orange fusion button, any Necrozma can fuse with a Solgaleo or Lunala in your boxes. One question remains, though. Can these Pokémon break away from each other? Is it permanent? What happens to your other Pokémon and their stats? There’s still so much that’s a mystery.
For example, if you have a shiny Necrozma (which you can catch at Go Fest), do you also need a shiny legendary to pair with it to get the shiny or just one of the two? I'm also curious about possible bugs that players can exploit or fall victim to. So much is unknown.