Hammersaur is a dinosaur/walking crocodile-like Bakugan with hammer-like hands. Anchorsaur is Hammersaur's opposite counterpart and the two are often used together.
Hammersaur is a bipedal reptilian Bakugan that resembles Anchorsaur. Unlike Anchorsaur, Hammersaur has large armored hands which are its distinguishing feature. It is almost always used with Anchorsaur because of their similarity. The similarity to Anchorsaur is probably evidence of being on the same evolutionary lineage but have split into two different evolutions.
A Darkus Hammersaur is seen in episode 3 of Bakugan: New Vestroia and owned by Shadow Prove but later captured by Baron. An Aquos Hammersaur was seen on Keith's computer in episode 7. In the semifinals of the Alpha City tournaments, Shun battled and captured Vanessa's Haos Hammersaur.
- Mirror Ghost: Nullifies the opponent's ability. (Haos)
- Flash Bow: Nullifies any ability. (Haos)
- Crush Hurricane: Transfers 100 G's from the opponent to Hammersaur. (Darkus)