Could be both Fire/Fairy and Water/Dark. It's kind of like they're combining Xerneas and Yvetal's typing with Primal Groudon and Primal Kyogre's...I have a feeling that a legendary mascot duo for this generation could be a Fire-type (Sun) and Water-type (Moon), but Fairy and Dark could work as well given Fairy tends to be associated with light.
Could be both Fire/Fairy and Water/Dark. It's kind of like they're combining Xerneas and Yvetal's typing with Primal Groudon and Primal Kyogre's...
It could also be Fire/Psychic and Water/Fairy (since Fairy is associated with the moon) or a combination of the four.
Thanks for the flashbacks to Gen V. I remember we thought Reshiram might be "light" type and Zekrom was part Dark based on the design.I could see Fairy for both mascots working, but Psychic could be a possibility for the Sun mascot, and Dark for the Moon mascot. Maybe when they get revealed in a trailer or something we could try and assume the type based on the design.
Digimon beat you to it on like, 2007.... Sorry....When it comes to my thoughts about the Legendary Mascots, I think they could be based on Greek mythology. The mascot for Sun could be based on Apollo, whereas the mascot for Moon could be based on Artemis.