I recall seeing this show about seven years or more ago on TV.
It had three main characters; one girl and two boys. One of the boys was an inventor, they had blonde hair, the other had dark brown hair and had this long gauntlet all the way up their arm.
This gauntlet (I believe) contained an orangish sort of crystal inside of it, and the pattern on the top of it along his arm was light-blue hexagons. This gauntlet allowed the boy to turn into different beasts that he encountered, I think one of them was some kind of big panda (similar visually to the Pokemon Pangoro).
The main story may have included some sort of big company that wanted to possibly capture these beasts for their own use? And at some point may have persuaded the blonde-haired boy to betray the other two.
They were able to travel to different worlds (through portals?), which is where they found these beasts.
This show was likely a computer-generated animation.
This show isn't Ben 10.
At some point randomly in the show, I remember they find Terracotta warrior statues; not sure that helps though.