Old cartoon that aired on Télétoon

Hi, I'm looking for the name of a cartoon that aired on Teletoon around 2010/2011, which I used to watch when I was younger. I remember that in this series, there were necklaces that the characters would put around their necks to summon monsters. I recall there being 3 super rare necklaces that summoned powerful monsters, and in the end, the villain managed to get all 3 necklaces and summoned a mega monster to destroy the world, but he was stopped at the very last moment by the heroes.