.mp4 is a standard container for digital video, likely encoded in H.264 or H.265.
The entity is revealed to be Baalmon , a Digimon known as the "King of Knowledge" who holds a book containing all the world's information. DigimonGhostGame_Ep_53_SUB_ITA.mp4
The episode reveals that the "ghost girls" assisting Baalmon were actually real ghosts , not Digimon, a rare occurrence for the series. Technical & File Context Technical & File Context Jellymon warp-evolves into her
Jellymon warp-evolves into her Mega form, Thetismon , to battle Baalmon. As a result, he begins to forget his
Ruli and Hiro challenge Baalmon with trivia he cannot possibly know (such as personal social media facts or specific camping details) to win back Kiyoshiro's memories.
Every time Kiyoshiro loses a round, the entity "steals" his knowledge. As a result, he begins to forget his friends, his work, and eventually his own partner, Jellymon.
While files with this name are common on fansub sites, you can watch the entire series officially with subtitles on platforms like Crunchyroll.