What is the show that used to be on Cartoon Network called with little boy and he had glasses robot big dude kind of looked like a superhero?

You're describing the show "The Amazing World of Gumball".

* The little boy with glasses is Gumball Watterson, a blue cat.

* The big, robot-like dude is Darwin Watterson, Gumball's goldfish brother who evolved legs and became sentient.

While Darwin isn't exactly a superhero, he does often wear a superhero-like costume and helps Gumball get into all sorts of wacky adventures.