I don't know, but you can at Play&Trade.
game spot
Yes. You can trade game boy games at game stop. You will get in store credit or cash for each game you trade in.
Yes at a game store you can trade it in more money or games
You can trade the game for the a dollar or so. -Abby Marie*
You buy them...Get them from game stop and game spot and anywhere you can buy games you can get them.
No.
You can't trade between game boy games on a DS.
yes
Game stop
You can use any games you have bought from anywhere and trade them into gamestop to get Game stop in store credits to purchase other games.
Yes. You can also trade them to GAME
No you do not get to trade games you get to trade in games for a small credit and then purchase the new game