(I'm just gonna list character locations like this:
Esther and Cas: away from the warehouse, Esther is just away from everyone kinda like me irl
Tiger: heading to his hometown
Berry: probably still at their home island, actually
Sandy: still on another island
Most of the other Pokémon: ???
Via and Spelunker: heading to the warehouse
Vani: some snowy area or whatever
Sam, Olive, Jirach and Victi: somewhere in the forest (Jirach is near Zeyrix, Terrayrian's character)
Raven: Ilex village
Any other characters I'm forgetting: wherever they are)