Crusty Gigabomb is the first ability for the Scallywag Mech. When used, the Mech will launch a massive bomb from its cannon, which will roll around shortly before detonating, much like the Chili Bean Bomb, though detonating slower and dealing more damage. It will deal up to 225 damage.
Because this takes a while to explode, make sure that you launch this from a distance to make the explosion hit enemies. You can also throw this into gardens, eject from your mech, then fire a Gravity Grenade, which vanquishes most enemies. However, using the Explosive Escape and Gravity Grenade combo may work better.