From the game Mario and Luigi Superstar Saga for the Game Boy Advance
This is very easy to do. Preferably, go to the east Beanbean beach, where the Bob-ombs are. Go onto a high ledge, and make mario tiny. The Bob-ombs should go on top of the high ledge, but not start a battle. They will not go behind the ledge, because of the overlapped sprites.
Submitted by: Dremo