How to make this fake reflection of Sonic Adventure?

Many 128bit generation games using that effect.
Someone knows how to do it, without using real-time Shaders.
I wanted a fake effect to use on mobiles.

Image:


Video: check in from 4:00 min

 

If you mean the reflection on the car - I would go for a custom shader that samples an environment map based on the reflection of the view vector by the surface normal.
The reflected vector can be calculated with this formula:
http://paulbourke.net/geometry/reflected/
Ri is the view vector, Rr is the result.
The coordinates of the result can then be used to sample a latlong texture like so:

Code (CSharp):

1.     float PI = 3.14159;
2.     float phi = atan2(R.x,R.z);
3.     float theta = acos(R.y);
4.     float U = (PI + phi) / (2*PI);
5.     float V = theta/PI;
6.  

where R is the reflected vector

 

I would suggest sampling a cubemap on a modern mobile wouldn't be terribly expensive unless you want a bad distortion effect for stylised purposes.

Also "128bit generation" is a nonsense term that is meaningless to most developers, it was purely just nonsense marketing.