It appears as if Niantic Labs have blocked PokeAdvisor from working with Pokémon Go. This comes after site creator lax20attack went on Reddit to say that Niantic’s servers were not syncing up to PokeAdvisor anymore. Saying..
“Wow, looks like Niantic servers stop responding to mine. Looking in to a fix, but this might be the end guys,” the post read. “Will keep you posted.”
PokeAdvisor is a Pokémon Go website that allows users to check a range of different statistics for their character and millions of others