Or is that explained in the game somewhere? But wasn't Terra's body essentially destroyed when Sora killed Ansem/Xemnas? He killed Xehanort's Heartless and Nobody, so there is nothing left of him nor Terra's body left anywhere to rescue. I don't know the exact details, but I can accept most of that.

According to the main page, the game sets up a mission to rescue Terra, Ven, Aqua, and Axel in another game.Because it'd take too much time? Because screwing around with something already screwed up is probably not the best idea? And even then, the way they did things was probably easier.So, if Data-Sora forgot everything because it wasn't in the journal, then why didn't Jiminy just write the events of the game in the journal?.Presumably, she actually didn't get digitised and is in effect her normal self, unrestricted by the usual rules of the data (which explains her potentially being such a pain to fight: She's not following the program.) Pete got sucked in at the same time as Mickey and company, and Maleficent teleported to him.How can Maleficent hack into a computer when she lives in a world without computers?.I assume you're talking about his rain of keyblades attack (the one which, in II, caused the background to transform into a sunset). Weirdly enough, it's Sora's Heartless who has the move from II.

If Data-Roxas only used Event Horizon, that might make sense, but he uses Magic Hour, which he only gets after Day 357, which happens a long time after CoM ends.

In any case, he's using the same super move that he used during the time that the Journal covers. It's even possible that he always knew the move, but never used it during 358/2 for some reason. Or maybe he learned it at an even later point, somewhere within Sora's heart. Perhaps he acquired the latter nearer the end of 358/2, in which case it's unclear why he never used it. By the time Chain of Memories ends - which is in the middle of 358/2 - Roxas has his 358/2 super move, but we haven't seen him use his super move from II. Logically, therefore, the same must be true of Data-Roxas.

Data-Sora can only reflect Sora as far as the end of Chain of Memories, because this is where the Journal ends.

So why is Roxas's super move the one from 358/2 instead of the one in II?.

Chain of memories tv tropes