Trachy, not sure why you asked for all versions but I modified the question a bit to make it relevant for BW2.
And Mew, I am not sure if that answer is correct - I have read the back of many signs but don't have the medal yet.
P.S. I prefer it if different questions are asked as different questions, they show up better when you search for them. Don't worry about clogging up Pokebase :)