Echoes of the Bond (Ash-Greninja Alola)

Ash is living his best life in Alola, enjoying the island life with his Pokémon and friends. But lately, something strange has been happening-he's been having vivid dreams of Greninja, standing in a dark void, reaching out to him. Ash doesn't understand what's going on, but every time he wakes up, he feels an unshakable pull, like Greninja needs him.

At the same time, strange energy readings are detected near Poni Island, where an unknown Ultra Beast is causing massive disturbances. When Ash and his friends investigate, a sudden Ultra Wormhole opens up-and out of it comes Greninja, battle-worn and desperate!