Not sure why you would use the PSC
Could the script in VMware View PowerCLI Script to Discover Un-used Virtual Machines help?Blog: http://lucd.info | Twitter: @LucD22 | PowerCLI Reference co-author: http://tinyurl.com/hkn4glz
I was looking more into the following
Get-HVMachine -PoolName 'MyPool' | select " last connected "
I will take a look