PoPoLoCrois Monogatari - Hajimari no Bouken (2003) [A-BT&Pakapuka]

Several years have passed since the world was saved from peril and Pietro Pakapuka is now the king of Popolocrois. Unlike himself, Pietro’s young son Pinon is far less adventurous and is fed up of being constantly compared to his father. One day Pinon follows a group of holy spirits into a small dragon shrine near the castle and whilst attempting to rescue a small creature, he finds his courage and defeats a large monster. Meanwhile, a mysterious dark presence is determined to capture and seal the powers all the holy spirits in order to envelop the world in darkness. It’s now up to Pinon to prove his worth as he works together with newfound friends Papuu, Luna, and Marco to protect the holy spirits and save the kingdom of Popolocrois. Source: Anime-Planet

Old encode, but this is at least the original release.