Ash, Iris, and Cilan meet up with Professor Juniper and Fennel who reveal they are going to revive a Pokémon fossil. The fossil is the pokémon Archen. Archen is a wild pokémon that likes to do as it pleases, but it cannot fly. Ash and friends decide to help it learn to fly, but while they are helping it, some mysterious seeds that were revived with it begin to grow out of control. Meanwhile, Team Rocket also set their sites on the newly revived Archen.