Pokémon Ultimate Journeys

Ash and friends chance into a Spoink that has lost the large pearl that usually adorns its head. The life force of these Pokémon, they learn, quickly dwindles when they're separated from their pearls. Anxious to save this unfortunate Pokémon before it's too late, they quickly set out in search of the pearl, mistakenly gathering numerous spherical baubles--and Pokémon--along the way.