In Veilstone city on Pokemon Platinum Version what does the guy who speks in a foreign language say?

The man you're referring to in Veilstone City who speaks in a foreign language is the Game Corner Owner, also known as the "Mysterious Man" or "Mr. Game Corner".

He speaks in what sounds like Japanese, and his dialogue translates to:

"You're a very lucky person. You're a very lucky person. ... Yes, you're a very lucky person."

He repeats this phrase whenever you speak to him. While his words don't really make sense in the context of the game, it's a fun little quirk that adds to the mystery surrounding the Game Corner.

Let me know if you have any other questions about Pokemon Platinum!