From the Super Mario Wiki
Bob-omb Blitz is a Brawl Attack usable by Bowser in Mario & Luigi: Bowser's Inside Story. Once Bowser frees the Bob-ombs from a cage in Bowser Castle, Bob-omb Blitz can be utilized in battle for 12 SP or 18 BP in the 3DS remake. In order to make this attack work in battle, the player must use the to line the Bob-ombs up with the enemies. If the Bob-ombs hit the same enemy, the enemy will possibly become Dizzy. If the player lines them up in the wrong place, they will run past the enemies and blow up nothing. In the original version, Bowser roars to send the Bob-ombs. In the remake, he uses a whistle instead.
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