This is the best option for Android and iOS users that want to run Flash Player:
Puffin Web Browser - The fastest mobile browser with Flash support over cloud on iPad, iPhone and Android.
Puffin runs Flash Player on servers in the cloud, and streams the results back to your phone. You get an up-to-date Flash Player, without needing to do anything sketchy to your mobile device.
The other options require you to side-load an old unsupported version of Flash Player for Android that's missing 2+ years of security fixes at this point. Installers available from 3rd party app stores repackage flash and frequently contain malware. Either way, you're leaving yourself vulnerable.