You can basically create a vMotion port group on any vSwitch if you want. However, keep in mind that vMotion can easily max out the physical NICs bandwith, which might cause issues with other objects using the same NIC. What I've done in the past is to create a vSwitch for Management and vMotion with two uplinks, where uplink 1 is active from the Management Network (uplink 2 as Standby), and uplink 2 is active for vMotion (uplink 1 as Standby). This way each port group has its dedicated uplink, but can failover to the other one in case of a failure.
André
