It's an alright game.
Despite it's in Japanese language, it's simple to understand if you know the basic rules of baseball (plus there are no opening scenes that drone on and on with that squiggly jap text).
I've found swinging the bat difficult, but pitching is just a quick swipe of the stylus down the touch screen.
Unlike Wii Sports baseball, you can attempt to get someone out by throwing it at a base (simple tap the icon of a base you want to throw to).

Definately some fun, and I don't think you're going to get a much better baseball game on DS.

If you're bored, I recommend checking this game out

 

Hehe, I've always like the Doraemon series, and I guess I'll give this a shot, despite being in Japanese.

 

More likely if the enemy is rat lol.

 

You dont know the rules anybody want me to explain them?