answered XY/ORAS Changing background of a battle?

[Flintiex]

Is it possible to change the battle backgrounds for certain fights? I've seen in wifi battles people using custom backgrounds due to some editing?

[Apache Thunder]

There's a youtube video that shows this off. It's from the guy who made the tool I'm about to link you to:

The video description contains info on how to use it.

Download link to the tool in question (also found in the video's description):

BVEditor.exe

Note that you need to have the ability to decrypt extData on SD card. This requires using SaveDataFiler. If you are not on an exploitable console, you can not decrypt your battle videos in a form that can be edited.