xScope Pro browser is a paid app and upon start up has a guide to installing the Flash apk from either Adobes website or a copy on XDA Developers forum, there's also other browsers available that support Flash including Boat browser and FireFox's newest release now supports HD Flash but you will need to source the Flash apk.
There is a thread on here by S.Prime with a link to the XDA thread, I'll post a link later but if you had searched first you'd have found it.
EDIT: I should refreshed the page before posting my reply, Prime beat me to it.