Tutorial Change battle background in usum (wifi battles)

jetj3232e · Mar 16, 2022

derboeseVlysher said:
Thank you so much for this guide, Lglaplante! Everything works nice for me.
I have experimented with the files a bit and I can give you all a list of which file corresponds to which background scene:
goo (dot) gl (slash) vy8nVB (It's a google document)

But that's not everything! I could also find out that "dec_155.bin" is the file which corresponds to the glowing rectangle which floats around the Pokémon in a WiFi Battle. So by replacing this file you can add other special effects (like spotlights via 157) or you can combine two scenes to have a background for your foreground to avoid glitches in the background.

Have fun with my list!

PS: I was not allowed to post a real link because I am new to GBAtemp. This is no spam but a helpful link, so please be kind to me, oh mighty Mods

it looks like the docs shared here has been deleted (not a surprise considering the age of the post but a new doc would be nice).

TeddyWestGeass · Feb 23, 2023

Anyone who was active in this thread when

XLuma said:
thanks for the doc you’ve made, it will help future people that want to do the modifications didn’t know about the dec_155 rho, interesting finding

The person who made that comprehensive list hasn't been on the site ever since, did you download it before it went down by chance? Same question to anyone else here. I started testing files to see how it works and am currently looking for any existing info I can

Gepulpo · Apr 28, 2026

I’m organizing an event to play with friends, and we’re modding Pokémon Ultra Sun in various ways. I came across this forum, but nowadays the links with the list of backgrounds are down. Since I managed to change the Wi-Fi battle background myself, I’d like to share my experience for anyone currently working on modding Ultra Sun.

These are the backgrounds I managed to identify by inspecting the binary code of each file (I couldn’t figure out how to use Ohana3DS properly):

dec_001.bin = First Route
dec_014.bin = Wi-Fi Battle
dec_015.bin = World Championship
dec_016.bin = World Championship Finals
dec_040.bin = Elite 4 (1)
dec_041.bin = Elite 4 (2)
dec_042.bin = Elite 4 (3)
dec_043.bin = Elite 4 (4)

I’ll keep inspecting and building the list.

AngeloftheNight091 · May 26, 2026

As it has come up recently I will attach the Plugin Kazowar Made for Retro and Myself Ages ago for USUM for Battle Backgrounds to change them live during battle. Please note, these have to be in the Plugin Folder for each game title.

\Plugin\00040000001B5000
\Plugin\00040000001B5100

Tutorial Change battle background in usum (wifi battles)

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