OK, I'm still looking at the battle format stuff and this time I'm on BN5DS. In the screenshot below, I capture the effects of a newly-discovered battle mode.
I can't remember for certain but this may just be the Party Battle Multiplayer mode. Seeing Customizing in the center and MegaMan with HP below is kind of odd, but maybe it's how it really went. There's not much to say except that it stays stuck on this screen. Oh, and Lan doesn't speak with this mode on. Unfortunately, this is the last interesting new mode added for the DS game. I tried getting Operation Battle back in, but it seems it goes further than I expected and may have been taken out completely somehow.