I'm visiting my parents, and I've noticed their town has a Magnamite and Voltorb infestation.
I've read about Pokémon nests, but the way to identify them is by seeing multiple of the same Pokémon on your radar at the same time.
I think we've had an update since that reddit post...since then I don't remember seeing multiple of any Pokémon on my radar.
How can I identify (and prove the location of) a Pokémon nest ?