Lets see... my friends from France gave me their French Yellow version so I could practice with French. (I'm learning it.) There's obviously English, Japanese, I'm pretty sure there's Italian, and Spanish is a near definite.
I saw a Jerman Pokemon forum once.
This kid goes to China every year and has showed me a Chinese Sapphire...
So, we have:
Attention noobs: Stop sending me PMs asking me to join forums or I'll eat you!