As previously said from Unowned, you can only obtain the IV reroll ticket for completing the quest without forfeiting at any point during the quest or battling Horon, which you did, so you are not eligible to get the IV reroll ticket.
However, you are still able to get another IV reroll ticket through succesfully beating Umbra in hard mode in the Battlefields.
The normal mode will aquire you the Gengarite Mega Stone, the hard mode the IV reroll ticket and lastly on the special mode, you get the Mega Gengar Clothes.
You can start the quest from the shrine in Unison Mountain South Summit.
Since everything was said and your issue has been fixed, I will lock this thread now.
If you have any issues in the future, make sure to let us know.
Have a nice day!