Granzeboma

Granzeboma (グランゼボーマ, Guranzebōma?) is the mecha piloted by the Anti-Spiral, created to fight the newly formed Tengen Toppa Gurren Lagann on even grounds, beat Team Dai-Gurren at its own game and put an end to the fight once and for all. Its styling is similar to the Tengen Toppa Gurren Lagann, with the Anti-Spiral home world as its core on its forehead and an extra pair of arms, located on its shoulders, which it used to catch the galaxies as well as execute its Infinity Big-Bang Storm attack, crushing to two galaxies together to produce a blast equal to a Big Bang to instantly vaporize the target. Though the attack was intended to annihilate Team Dai-Gurren, the maneuver backfired when Lord Genome used the Lazengann to take the blast, converting it and himself into Spiral Energy for the Tengen Toppa Gurren Lagann. It was ultimately destroyed when Simon and Nia managed to pierce its pilot's body with the Lagann's drill, using the Lagann Impact. Notably, the Grand Zamboa's arms were in fact able to transform into drills, normally a symbol of Spiral Beings - however, when they are shown stationary, the drills in fact have entirely straight lines from base to tip.

The second Gurren Lagann movie, Lagann-Hen introduces the Super Granzeboma, an upgraded form of Granzeboma made to counter the Super Tengen Toppa Gurren Lagann. While being just as large as its foe, the Super Granzeboma was destroyed in the same manner as the anime version.

Attacks
Infinity Big Bang Storm: Granzeboma grabs two galaxies with its larger, shoulder arms and mushes them together into a ball. Granzeboma then throws the ball at the opposing mecha.

Anti-Spiral Drills: While Granzeboma is an Anti-Spiral mecha, it still can create drills. These drills do not have a double helix on them, but, instead, have somewhat straight lines along their bodies.

Trivia
The Romanisation of Granzeboma had been unknown for a long time, and a Romanisation was created that was Grand Zamboa. Eventually, the website for the Movies revealed that the proper way to write it in English is Granzeboma.