After examining a mysterious crystal, Twilight Sparkle is sent to the Alola region, two weeks after the Darkness Crisis and the Rainbow Rocket takeover of Aether Paradise. Now trapped as a human in a world of strange and powerful creatures, with few allies known to her, she searches for a way back home with the help of the Alola Champion Corey, along with his fellow Trainers and their Pokemon.

As Twilight struggles to find a way home, in Equestria, a dangerous power play by a banished King throws the whole of Equestria into chaos. The only pony who can match this terror is Twilight Sparkle. Trainers, Pokemon, and Ponies...

Prepare for one wild ride.
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Pokemon Ultra Sun crossover, set after the endgame and RR episode, so expect a few spoilers here and there. Will feature more trainers at some point.
Here is a spreadsheet for the trainers' rosters Take a look!
Will have some trainer ships.