Pokemon Best Wishes! Hikari to Kage no Tenkyuugi

Satoshi and his friends are gazing up at the moon in the night sky one night when the Rocket-Dan creeps up behind them kidnaps Pikachu!! Our heroes chase the Rocket-Dan through a forest and eventually reach the ancient ruins of an "armillary sphere." There, Satoshi and the others see the sky burst outward like never before! Three spheres float in the darkness and mystical murals cover the walls. Pikachu can be heard screaming out for help deep within the darkness... will Satoshi and his friends be able to uncover the mysteries of this armillary sphere and retrieve Pikachu!?

(Source: Dogasu's Backpack)