At some point it digivolved into a Keramon. Eight years after meeting Arata, it meets him again in EDEN, possibly recognizing him. Arata shows Keramon to Aiba for the first time when they enter a digitalized Shinjuku subway, after the duo notices Digimon are able to materialize in the area. By the time Arata and Aiba have entered a digitalized Akihabara, Keramon has digivolved into Kurisarimon.
Before going to the Digital World, Arata asks Aiba to come to Under Zero with him to help defeat the Knightmon that defeated him and the rest of Jude years before. Should Aiba choose to do so, they defeat the Knightmon together. Arata's happiness at finally breaking into Under Zero causes Infermon to digivolve to Diaboromon.
If Aiba chooses not to do the quest, Infermon digivolves offscreen and appears as a Diaboromon to help Aiba fight against a King Drasil unit whilst in the Digital World.