A mysterious Digimon that is said to only be born on the evening of moonlit nights. It is said that Relemon born specifically on the evening of the full moon receive it's magical power, and as they grow are able to use greater and more wondrous abilities than other Digimon. Because it is nocturnal, it seldom appears before people and has a shy personality. It is not able to attack, but it can transform into anything to defend itself, if it is close to the size of its body. However, it can still be found because it can never conceal its tail.

月夜の晩にしか生まれないと言われる神秘的なデジモン。特に満月の晩に生まれたレレモンは満月の魔力を受け、他のデジモンよりも能力が高く不思議な術が使えるデジモンに成長すると言われている。夜行性で、めったに人の前には姿を現さない恥ずかしがりやな性格。攻撃はできないが、体のサイズに近いものなら、何にでも変化して身を守ることができる。しかし、いつも尻尾だけは隠せずに見つかってしまう。