PS script for moving clustered VMs to another node

You don't need to enumerate the VMs yourself. Failover Clustering can drain the node and live-migrate its clustered roles before the reboot:

Import-Module FailoverClusters

Suspend-ClusterNode -Name "HV01" -Drain -Wait

If everything must go to one host, add -TargetNode "HV02"; otherwise the cluster selects suitable owners. Before rebooting, confirm this returns no VM groups:

Get-ClusterGroup | Where-Object { $_.OwnerNode -eq "HV01" -and $_.GroupType -eq "VirtualMachine" }

After the server returns, run:

Resume-ClusterNode -Name "HV01" -Failback NoFailback

Use Immediate instead of NoFailback only if you intentionally want workloads moved back. Also verify the remaining nodes have enough CPU and memory capacity before draining.