Registration Validator works WITH standard Joomla registration, it simply validates the details once they are submitted - any that fail the checks will be rejected.
I am not familiar with YOOLogin - it may be that this is actually replacing the standard Joomla registration which will prevent Registration Validator from working. As YOOlogin is a paid for module/plugin, I cannot download it to be able to add support for it - on the basis that I provide my Joomla extensions for nothing, I object on principal to paying for others!!
I should be able to add support for it if you could send it to me. I have no interest in it personally, but so long as it isn't encrypted too heavily (if at all), I should be able to install it on my test site and modify Registration Validator to work with it.