Thats actually not a bad theory OP, but
>synchro
Anime only

I also have a feeling Rotom-Pokedex if it becomes an actual playable Pokémon, it's gonna be Electric/Steel

>>26601423
I'm pretty sure Ash-Greninja and the other Kalos Starter Finals will have some kind of role in Sun/Moon

>>26601375
>kanto starters in gen 7.
we had kanto starters in xy johto starters are going to come back in gen 7 instead.
>litten will become fire/poison because of one trait that will be lost upon evolution.
yea no
>20th aniversary wanted to recreate the Kanto Starter feeling
>They swapped the Grass/Fire second types
>stretching this far to make some kind of conclusion

>synchro
wont be what you think it will be.
It will be stat boosters like it is in Pokken.
GF realized they cant keep making mega and wastingdesign time and energy making new models and art and movesets and abilities for past pokemon. they also realized theycant add more and more mega stones, that just fill up your bags, for you to just use one of them. Syncro may change typing like megas did but i highly fuckin doubt it. it will just be raw stat boosters. and it might not even last the entire fight. but rather only like 5 turns as to be used strategically.

>>26601629
I think Rotom-Dex would be Electric/Normal instead with Hyper Voice. Normal because the dex is a computer and the only other computery/digital Pokemon (Porygon) is Normal; Hyper Voice because it talks.

>>26601375
I really hope Popplio gets a secondary typing. Last gen felt like an homage to Kanto; I don't want this one to feel the same.