My name is Cris, Brazilian. I've been living in Shanghai, nearly 2y.
I hold a legal Chinese drivers license, (thou I passed the written exam, no info related to plates themselves).

Recently, I went to a shop in Hongqiao to see a 650cc CFMoto, I wanna buy it, but I dont understand how the license plate system works in Shanghai.

I was told there are several types of plates (yellow n blue), plate C to use outside SH and, another type for downtown Shanghai (Luwan, Xujiahui, Huangpu etc..).

Many ppl told it's okay to get a plate from another city n ride in SH, (personally, I never found it hard to drive a petrol scooter, no plate. Indeed, from what I was told, its license plate s ard 10k.... well, a scooter is 2.500, not worthy to pay the price of the license, even if the cops take one way, u can buy 3 others).
Is it okay to use a C one in Shanghai?, because they are cheaper... Still, at the shop, the seller told me, "it does not matter what type of bike u get, scooter or big ones, the license plate is the same price". Which I doubt, again, some ppl told me that for scooters plates are ard 10k, big bikes ard 70k.. and depending on, you can transfer/ use for a car.
I was even suggested to register the C one under a Chinese person's id.
Where can I get precise information abt it?

Thanks for the attention,