[Age of Kings]

Originally Posted by Fat Sprocket

According to the official players guide, it's merely "Try the Battle Subway 100 times or more". It doesn't say anything about winning 100 times in a row.

I love that there are medals for using Splash and Struggle.

Also apparently medals for catching a Pokemon with Pokerus. I have a feeling that is different than simply possessing a Pokemon infected with Pokerus.

http://www.serebii.net/black2white2/medals.shtml

This is the list I'm going by, and the medal says "Reach a streak of 100 in the Battle Subway".