i don't think its possible, well not without downgraded graphics
Street Fighter 4, another Capcom game, is on the iPhone. it's possible and yea you'll lose some in graphics. Call of Duty Zombies is on the iPhone and it's not bad either.
and just for a gpu comparison
* Motorola Droid: 550 MHz TI OMAP3430 with PowerVR SGX530 = 7-14 million triangles/sec
* Nexus One: 1 GHz Qualcomm QSD8×50 with Adreno 200 = 22 million triangles/sec
* iPhone 3G S: 600 MHz Cortex-A8 with PowerVR SGX535 = 28 million triangles/sec
* Samsung Galaxy S: 1 GHz S5PC110 with PowerVR SGX540 = 90 million triangles/sec
* DS: 120,000 triangles/second
* PSP: 33 million triangles/sec
* PS3: 550 million triangles/sec
* Xbox 360: 500 million triangles/sec