then that means you cannot sell them.
"Due to the ability to modify code to make Pokemon shiny in X/Y (also being unable to tell the difference), I'm tightening the rules a bit. Selling shiny Pokemon is NOT allowed here unless :
1. You hatched them under your game's OT/ID.
2. You can provide proof to the Reddit thread where you got the egg hatched.
3. It's a Kalos event such as the shiny Jirachi with moonblast.
Anyone found selling hacked shiny Pokemon will have their Play Coins disabled. If someone messages you in private to sell a hacked shiny Pokemon, please report them and (1) their Play Coins may be disabled (2) You'll get all of their Play Coins.
#2 depends on if they're aware of this rule and still choose to sell hacked shiny Pokemon.
The selling of perfect IV non-shiny/shiny Ditto clones are allowed for personal use ONLY.
This is now in effect as of June 21st. All shiny trade threads that were already posted are allowed."
This is basically the rules you need to know