One week before Ash is supposed to officially take the mantle of Alola's Champion, Professor Oak's lab is attacked. With many of his Pokémon missing, Ash embarks on one final adventure, unaware of the shadows hiding around every corner or his true destiny.

When Clementine and AJ found themselves back on the first day of the apocalypse, it was a wish come true. Given the the power to change the past, they restart their fight against this dying world. But with history trying to right itself, will they succeed in saving anyone...or will they suffer the consequences for messing with time?