Hmm One of the assitant editors that I work with says FCP runs fine on his Blackbook. He didn't say anything about Motion so I'll have to ask him tomorrow.
Why not just go to the source?
http://www.apple.com/finalcutstudio/download/
"# AGP Quartz Extreme or PCI Express graphics card (Final Cut Studio is not supported on systems using the Intel Extreme Graphics 950 GMA)
# Motion requires the standard graphics card found in any Mac Pro, MacBook Pro, iMac Intel Core Duo, Power Mac G5, iMac G5, a 1.25 GHz or faster PowerBook G4, or a 1.25 GHz or faster flat-panel iMac."
It's not *supported* but it can run...
https://forums.macrumors.com/threads/207297/
"Final Cut Pro runs well on the MacBook- but dont expect all the Full Quality Real Time Rendering for multiple HD tracks that the MacBook Pro can handle. I've seen benchmarks that say Motion CAN be run on MacBooks, but isn't supported and has shoddy performace (Intel GMA - Duh...), but DVD Studio Pro and Soundtrack Pro work fine too."