Currently it is only possible to generate 1 address per command:
getnewaddress 'account'
I think it would be really useful to add an optional count in the command. Therefore, if someone wanted to generate e.g. 200 addresses, they could simply do so with a single call of this command.
I'm also not sure why it still has 'account' as an argument considering that it's deprecated? Bitcoin Core 0.13.2