Okay, so JUUUST to be sure: In Eligor, I pick the Pokemon, put in my TID and SID, enable ID matching, enter everything else I want. (In my case, I want a shiny adamant Absol and don't care for IVs, so I pick those thing and leave IV blank). Now I can copy these PIDs and IVs that Eligor generates and put them onto the template Absol (which is a legit Colosseum Absol) in PKHeX, and if PKHeX at this point says it's legal, then it is indistuingishable from a legitimate shiny adamanant Absol from that game? No way the game(s) in the future or if someone somehow checked its data it'd look edited?
(Sorry, I'm a little new to all of this, just wanna make sure)