I have read almost all the threads related to logging SIC time, but I was still wondering if you could log SIC in this specific situation.

The Metro III is a single-pilot certified aircraft. However, in order to be flown that way the aircraft must have a functioning autopilot and the PIC must have a single-pilot type PIC rating. If the aircraft does not have an autopilot, nor does the PIC have a single-pilot rating in the aircraft, then could the co-pilot log SIC time in a part 135 operation because he is technically a required pilot?

Thanks