Thanks for the replay and for the good wishes! Finding a way to show all four sprites at once would be really hard since you just don't have the same resolution as in GBA. It'd probably mean having to create new resized sprites that I don't think could ever look good even if I somehow managed to get everything working. The battle HUDs alone take up a lot of space so I can't really imagine fitting 4 pokemon and four battle HUDs at a time. I thought about it before I started working and had to dismiss because it wasn't viable at all -not impossible though, but it's unfortunately beyond what I'm willing to try.
The idea is that there would be a few double battles here and there, not too many. Maybe 1-in-10 ratio at most so that it hopefully doesn't get too annoying. The suggestion about only showing one backpic when selecting the moves is not something I had thought about; I'll consider it. Personally, I think it would be more intuitive to have the current Pokemon backpic show even if that would invlove an extra sliding. It doesn't add any difficulty programming wise (can be changed in ten mins really, since it's just swapping a couple functions) so I'd test it and see how it looks like. Btw, something that isn't shown in the video is that when a Pokemon is scrolled in, instead of looking like it's coming out of it's pokeball again, it slides from offscreen (the opposite to what happens when the previous pic slides out). I think this makes it look a little bit better hopefully.