I am currently trying to enable the invisible PSS sprite and in my search I found one for Calem on ORAS, which is not included on the PKHeX Multiplayer Sprite drop down menu.
With the Calem sprite I'm certain there's a Serena one along with the invisible one, is there some way that they can be found? Without going through 100s of save corruptions searching for it using HxD.
Also the invisible sprite player was not from X&Y, they battled with the ORAS ruleset, confirming the game they were on.