I wish you a Pretty Happy Birthday, is it correct?
It would be better to say:
I wish you a VERY Happy Birthday
Normally, when you say that something is pretty good it means that it’s not great or that it’s not especially good but its OK.
You wouldn’t wish someone an OK Birthday (unless you didn’t like them very much!) because you want their birthday to be special.
Recommended for you:
Other ways to say Happy Birthday! – MyEnglishTeacher.eu
How to Express Good Wishes Using MAY?
british-and-american-slang-words – MyEnglishTeacher.eu