It was a live-action, can't remember if its a show or a movie (I was really young then), but here's everything that I can remember:
Three teens (two boys and a girl) found an old device (in a garage, maybe) with a black and white picture showing a digital image of someone's face on it. He gives them a silver colored super suit that increases strength; they used it to get rid of some bullies. Later, the superhero gives the girl something that can make her invisible.
He also tells them that there's a supervillain named Crab or The Crab (not sure if it's the correct name).
Meanwhile, the supervillain (who is, by the way, an old man in a wheelchair) gives his granddaughter (or maybe just a teen girl) a super suit that increases speed (she was able to make an acrobatic move immediately).
Also, I remember that some kind of a malfunction came over the superhero's device that made it forget things (something like amnesia), but one of the two boys was able to fix it.