"SUB_ITA" indicates that the Japanese audio is paired with Italian text subtitles , typically used by the Italian anime community for episodes not yet dubbed in Italian.
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. DigimonGhostGame_Ep_53_SUB_ITA.mp4
.mp4 is a standard container for digital video, likely encoded in H.264 or H.265. "SUB_ITA" indicates that the Japanese audio is paired
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. Jellymon warp-evolves into her Mega form, Thetismon ,
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.
Jellymon warp-evolves into her Mega form, Thetismon , to battle Baalmon.
While files with this name are common on fansub sites, you can watch the entire series officially with subtitles on platforms like Crunchyroll.