GameManxVIDEOS recently posted a video of Tatsunoko vs. Capcom being played on a Playstation Vita. He utilizes the PS Mobile Suite PC Remote Vita App to connect to the Dolphin Wii emulator running on his PC. It runs decently, though it hangs up at times. Perhaps with a bit of tweaking by the hacking community it might end up running smoothly.
Tatsunoko vs. Capcom Played on a Playstation Vita