People shouldn't let cheating degrade the quality of education. You either possess the skills or you don't, and if you don't you shouldn't act like you do. It'll probably be obvious. Here's the scenario in my mind...
A: "Oh hey I know how to program Scala"
B: "Ok program Scala..."
A: "Well I only got the cert, I don't actually know."
B: "Sorry I guess you're not qualified then. Why don't you learn?"
I think it was more of a broad sketch of a series of interactions, not a formula for an interview. Someone represents themselves as having some skills because they are certified as having those skills; they are asked to apply those skills; etc...
Your format implies more formality than a normal conversation - I assumed you meant it in terms of an interview too, and if not that, I'm not sure what you were aiming for. I don't see conversations like that outside technical interviews.