Like what the title says it's in the US (not sure if its on other countries)
http://en.wikipedia.org/wiki/Mega_Man_Star_Force_%28anime%29
For right now its on toonamijetstream
http://www.toonamijetstream.com/, but soon it will be on cartoon network
Hope this helped
Cartoon Network on August 25th with Ep. 1-4.
I love the mega-man series...