Yeah people trade a lot of failed breeds on wonder trade so it's very useful. Also in my experience I've gotten like 5 shiny Pokemon including a 6 iv shiny rayquaza from wonder trade lol.
Too bad cause metagross i dont count as a legit shiny since i got that in a mystery gift and it wasnt legit like audino. Audinos look really tanky but not on milotics level of tanky
I got a shiny Pinsir in my Leaf Green through soft resets. I'm thinking about transferring him into ORAS.... He has the Earth Ribbon from XD: Gales of Darkness!