|First appearance||A Royale Pain|
|Voiced by||Ron Pardo|
Boulderon, Argus (アルグス, Arugusu?) in the Japanese version, is the Guardian Bakugan of Paige in Bakugan: Mechtanium Surge. His BakuNano is Slingpike and his Mechtogan is Vexfist. His Battle Suit is Blasterate.
In True Colours, he battled alongside Wolfurio and summoned his Mechtogan Vexfist to fight against the Chaos Bakugan, Rockfist, and Deezall. By combining his attack and Vexfist's, he defeated Rockfist and won.
- Ability Cards
- Magnetic Shield
- Bolt Motion
- Portal Magnet
- Burst Quench
- Hyper Sway
The Pyrus version has 380/440/500/560/620/680 Gs. The Subterra version has 380/440/500/560/620/680 Gs.
- Its Bakugan form bears resemblance to Gember and Mo-shogun from Tengen Toppa Gurren Lagann.
- Its ball form resembles Warius, especially its arms.
- Boulderon was the last Bakugan to be released in North America.
- Its Bakugan form also somewhat resembles two other things - Tony Stark's Hulkbuster Armor from Iron Man and The Hammer from Sym-Bionic Titan.