I just did it today and you need 10 ribbons on the pokemon that is FIRST in your party. It is easy to go to the lady in sunnyshore or get them in contests.
You need either eight or ten ribbons. I haven't gotten in myself, but I've read guides, and some say eight ribbons, others say ten. I'd say try it out for yourself and see what works. (:
I have heard you need to get 10 ribbon on one Pokemon this can be any type many advise getting 7 off a lady in sunny-shore
You need 8 or 10 ribbons to get into the Ribbon Syndicate in Pokemon Pearl.
I think you need 10 on the first pokemon in party. All I do is enter contests n stuff but theres much more to it than that
Kaboom and the stain is gone!
Cool - I'm going to try that