To obtain Cresselia on Pokémon Quetzal (v0.8.1), you need to have 6 Pokémon in your party that know the move Moonlight. You can catch a Fairy-type Pokémon that can learn it and teach the move through the menu—repeat this until you have a full team.
Once your team is ready, head to Meteor Falls. Use Waterfall to enter the deeper area, go down the stairs in the next room, and then climb back up. You can use the image as a guide to locate her exact position.
You can see how to get it in this video.
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