from Pokemon Mystery Dungeon Explorers of Time/Darkness/Sky

Relevant excerpt from the game credits:

Sound Director:
Misaki Okibe

Composition & SE:
Arata Iiyoshi
Hideki Sakamoto
Keisuke Ito
Ryoma Nakamura
Ken-ichi Saito

Imported and adapted from https://bitmidi.com/uploads/85707.mid