Retrieve a list of Azure VM and their VM Size in a specific Resource Group

ListRGVMsizes.ps1

function ListRGVMsizes($Rg, $VmSize)
{

    if($Rg.Length -gt 0){
        $VMs = Get-AzVM -ResourceGroupName $Rg

        foreach($vm in $VMs){
            if ($vm.HardwareProfile.VmSize -like "*"+$VmSize+"*"){
                Write-host $vm.Name ": " $vm.HardwareProfile.VmSize
            }
        }
    }

}

#this example will search for all VMs that are of "B" Series
ListRGVMsizes "resource-group-name-here" "_B" 

# Check this link for valid Azure VM Sizes
# https://docs.microsoft.com/en-us/azure/virtual-machines/sizes