From the Super Mario Wiki
Rob-ombs are a stronger variety of Bob-omb found in Super Mario RPG: Legend of the Seven Stars. They can often be found walking in simple patterns in the stairwells of Booster's Tower. Also, Booster himself keeps a personal store of Rob-ombs on his private train. As other Bob-ombs in the game, Rob-ombs can attack only by self-destructing and damaging an opponent.
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