The 3DS has Donkey Kong Country Returns which is a Wii port. It has Metal Gear Solid 3 which is a PS2 port (not best port ever, but still...)
Both done by relatively high budget teams who had access to their original source and the full 3ds sdk.
Another example: The Vita can run Persona 4. Nothing anyone in most of the scenes combined could make another ps2 smt game run.