Hopefully the Ultra wormhole boost your shiny chances.
Try using a rotom encounter as well.
I don't know if that will make a difference.
The ones I'm talking about aren't in Ultra Space. The chances of shiny are increased in Ultra Space (supposedly).
I didn't get that Rotom boost yet, but I don't know how those work; they seem to randomly show up. I have Friendship, Money, and some other ticket.