Stocks with a sustainable competitive advantage

Hi,

I would like to know how you guys are finding stocks with a sustainable competitive advantage in an efficient manner.
Obviously I could just read every annual report there is and try to find the gems. But do you guys have any other technique for finding such companies which is more time-efficient?

Examples for sustainable competitive advantages:
regulatory barriers, asset barriers, scale-based barriers, switching costs, brand name, research facility barriers...

I like to try pick the best performers in emerging markets.

Okay, but the question was how you find stocks with sustainable competitive advantages, not your personal investing strategy...

By picking the best performers in emerging markets you can get yourself into stocks that have sustainable competitive advantages is what I was meaning.

Okay, and how would you avoid stocks that went up for no reason? Like the tech stocks in the 1990s?