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LunarFool
Since: Mar, 2019
berpipo
Since: Feb, 2021
jormis29
Since: Mar, 2012
jormis29
Since: Mar, 2012
jormis29
Since: Mar, 2012

This is driving me crazy and i am starting to think i imagined this one. But it's an old CGI Cartoon where a bunch of kids explore the ocean by having pet robots turn into diving gear, which also gives them super weapons to fight against some evil guy with a punk hair cut.
It's also a big adventure with continuity and quasi-constant progression, The characters were: a cocky boy who could shoot cyclones from his chest, a reasonable that had some stun powers, her little brother who has submarine that he later turns into a robot, and a wannabe reporter girl that's never part of the action.
I remember watching it in french on teletoon, i can't pin point the year since i was really young.
Pretty sure it had at least two seasons, with the second one introducing an incompétent pirate.