Tsarchasm1

So I’m playing the game (Legends: Arceus) with no mods, no jailbreaks, nothing of that sort. I’ve caught Arceus, completed everything mission wise and I’ve noticed the entry for Arceus is at 0 of 1, despite me collecting his legend plate. Is there a way to fix this problem here? I don’t want to change anything else? Just fix this so his entry is complete in the dex as it should be. I’m not very tech savvy so I’m having trouble finding tutorials for this game on this site.