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You can stream Gundam Build Fighters (2013) on Crunchyroll with a subscription.

Sei Iori is a Gunpla builder whose family runs a hobby shop in a small town. He aspires to be a Gunpla Battle champion like his father, but despite his exceptional building skills, he lacks the combat abilities to compete with other contestants. Then one day, he meets a mysterious boy named Reiji, who helps him improve his confidence in participating in Gunpla Battles. Together, Sei and Reiji battle their way to the 7th Gunpla Battle World Tournament.

A brilliant model builder with zero combat instincts finds his perfect match in a reckless fighter who turns plastic machines into living weapons. This high-energy rivalry turns a quiet hobby shop into the center of a chaotic, neon-soaked battle arena.