Hello Thapelo,
I think what Bob was talking about is the manual robustness check you can do even with the MetaTrader backtester.
When you are ready with the backtest, just change some of the parameters with a small step as 1-2 points and do the backtest again. If you see a dramatic change in the Equity line, that gives a sign for over-optimization. Basically, we do the Monte Carlo manually :)