Yesterday I downloaded the app RadarGo, and it works.
I googled to see if anyone had experienced banning for using it and found none.
You don't have to sign in, so it isn't really traceable that you use it.
There is an upgrade for $1, but the free version which I use is great.
I read that leaving it running will really drain battery.
When I see a nearby Pokemon that I really want, I open RadarGo. It shows which direction the monster is in, how long it will be there, and even shows location on a map if you click on it. Then I close RadarGo and go get that monster.
I've used it to find a nearby Dotrio, Charmander, Venusaur, and Abra with 100% success.
Call me a cheat, but I recommend this free app.