Conqueror of the Viridian Gym
I got pretty lucky in VC Crystal recently. Not only did I get a shiny Elekid from the Odd Egg (2% chance), but I also encountered Miltank at 5% via dupes clause. Even then, it was only my second encounter and I run a three chances rule where I have to get whatever the third thing is so I could have easily duped out or gotten one of the other more common non-dupes (Pidgeotto or Magnemite for example). Then I encountered Mantine AND Skarmory without invoking dupes clause at all, plus a shiny Onix while Victory Road grinding.