DIGIMON FRONTIER: ISLAND OF LOST DIGIMON

The five digi-destined children stumble upon an ancient island inhabited by two different types of digimon; The Beast types, and the Human types. When they see two young digimon-a beast and humanoid-have become friends, they decide something must be done about the feud. (Source: Anime News Network) — Description from AniList community (anilist.co).