It’s likely a difference in game version, one of you is likely on 1.2.3 and the other is on 1.2.5/1.2.7. Delta Haxorus was among the mons that received a graphical update in the new patch. If you download the 1.2.7 core/patch (have to download the core if you’re on 1.2.3, can download the patch if you’re on 1.2.7) here, then the backsprites should now look the same.
1 Like