Metal CardBot

A long time ago, there was a planet named Machina where a race of sentient machines, or Metal Cardbots, resided. One day, the planet suddenly explodes, forcing its inhabitants to live on Earth. To not attract attention, the Cardbots disguise themselves as everyday vehicles. In the present day, Jun, an elementary school kid who loves BMX, accidentally discovers the Metal Breath, a wrist gadget that allows him to capture and power up the Cardbots with different abilities. Together with Blue Cop, Jun embarks on a new adventure!
DISCLAMER: I will be wirting this of how I understand the seiries and while adding some of my own ideas as I write.