Here is how you can install Pokemon Go in unsupported android version like KItkat , Jelly bean, Ginger bread and So on!
This is technique 2.
Direct link for the app:-
[Solved] How to install Pokemon Go in unsupported Android 4.4, 4.2, 4.0 , 2.3? | Technique 2. Pokemon Go [DOWNLOAD] Apk android 4.4.2+. Apk Pokemon Go v0.33.0 android 4.1.2 e 4.4 Kit Kat.