I-140 was denied and MTR was also denied.
Is I-485 is still valid?
A) With out immigrant visa(140) approval, you do not have valid status to file 485. As soon as 140 is denied , USCIS should have denied your 485 also. Did they not ?
Does 180-day Portability Rule apply and can he file a new application if he find a similar job in the same or similar classification?
A) Not with a denied 140.