Malicious Pokémon GO Apps Appear in Google Play
Pokemon GO Ultimate locks the screen after the app is started, forcing the user to restart. After reboot, it silently clicks on porn ads online.
Scammers will always try to snare people by hijacking popular apps. Be very careful to check the author of an app in the app stores, and never download an app from a side store, if you are not very, very sure that it is the right thing.