GamePress
Are there rotating nests?
Do nests change species?
I have a nearby park. A few weeks ago, I went, and there were tons of Squirtle everywhere.
A week or so later, a ton of Shellder. (Liked that, got several good Cloyster)
Now, a ton of Eevee (admittedly, less remarkable, still far more frequent than normal)
Wondering what will show up next week....
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Answers
It doesn't predict...it reports.
When you go and find a nest, and work out what it changes to then you report it.
If others confirm your reports then it becomes a documented nest that others can see and go to.
It is community driven by results...no predictions.
After Thursdays expected nest migration, you can see what changed and report it to the Silph Road Atlas.