1. Take something random. (Ariados, for example)
2. Analyze the Metagame.
3. Make a set that has the highest chance to be sucsessfull (Sucker Punch, Shadow Sneak, X-Scissors/Poison Jab, Sticky Web for Ariados)
4. Make a solid team around it.
5. Peak something around 1800 on the ladder of the...