Veeam Management Pack has out of the box reports which could work for you.
Veeam VMware Performance History Reports \ Virtual Machines. CPU Performance History - just uncheck all the other metrics except cpuCoStopPct and you will get history for all VMs, you can optionally group everything into a single chart, by selecting to split into sections by counter and displaying one chart for all objects.
Veeam VMware Performance History Reports \ Global. Top (Bottom) N Contained Objects or Instances - specify all VMs as a scope and select VmGuest cpuCoStopPct counter
You might want also to check our new version 7, in which you can create a heatmap of VMs on hosts in a certain cluster which will highlight VMs with CPU Co-Stop issues. For instance you can display number of CPUs (or CPU usage in MHz) as a VM size and CPU Co Stop as a color, this way you will see if certain VMs are experiencing co-stop issues and if there are any other "fat" VMs (in terms of vCPU number or CPU usage) on the host which may be the cause.