The reason they're hacked is so that they can have 31 IVs in all required stats (like 31 in SpA and Spe for a special sweeper and such) as well as getting the right HP type and power. It's just a much more reliable and faster way to creating these teams.
Requirements:
- Access to ARDS/Pokesav - Help me hack gym leader's pokes
- Above good battler - Score a 15 on the testing period
- High Interest - Won't give up after a few weeks