Delegating tasks to unused warriors helps your army grow. Here's a brief summary of what Delegating will get you.
Training- Depending on what level your training areas are (farm, ravine, etc.), higher level increases link exp and chance from training (as it doesn't always work)
Developing- Best to use on a kingdom with a Gold mine, and occasionally will spend money to upgrade locations. Usually about 500 gold. Won't work if no money and delegating on a non-gold mine kingdom
Search- Best used on kingdoms with 2 or level 2-3 training areas. Small chance to befriend warrior. Higher chance to link with an indigenous Pokemon.
Added by: Glaceon Sep 24th 2012, ID#17566