The Lake Legends event has now come to an end. As I said in the post with my 100% Goldeen I was going to try to do an Azelf and Uxie Raid throughout the weekend. Which I did! It took me a few tries as

We have some new regional Raids in Pokémon GO now. Like we had with Entei, Raikou and Suicune. In the main games these roam, which is why they decided to make them regional changing raids upon their release.