Bob-ombast

Bob-ombast is an attack that Admiral Bobbery learned in Paper Mario: The Thousand-Year Door. This attack is one of the most powerful attacks any of the partners are capable of, with a base attack of 6. However, the attack costs nine Flower Points. Bobbery can only use this attack after being leveled up to the Ultra Rank. In order to execute this move, the player must rapidly tap the button to fill the gauge as much as possible. This attack is similar to Bombette's Mega Bomb from Paper Mario.

This is the only non-jump attack that will ground flying enemies, except for a First Strike Bomb. It will even ground Parabuzzies and Spiky Parabuzzies, even though they take no damage from explosions.