Soko ni sora ga aru kara was the first ending to the Japanese Pocket Monsters Advanced Generation series. It features Satoshi and Pikachu sitting down under a tree, sleeping, as the sun sets.
Dandelion seeds are seen floating around as Satoshi wakes up from his nap and watches them fly away. Pikachu wakes up and yawns as Satoshi pats it on the head. Pikachu jumps up on Satoshi's knees and watches the dandelion seeds float around for a bit.
Satoshi catches one of the dandelion seeds in his hands and then lets it go and watches it fly into the sky with the others.
The ending finishes with Satoshi giving Pikachu a hug as the song fades out.