Quoted By:
Dark: You can leave the lights out
Fire: You can use fire for lighting and cooking
Electric: You can use the electricity to power everything (cheapest gym to maintain)
Grass: You can make and sell trees
Water: You can sell water bottles to passing trainers.
Rock: You can sell rocks and get bake. But you have to be careful of Officer Jenny.
Fighting: You can hold Martial Arts classes.
Dragon: Uh.. they are big guys and require a lot of food, and they don't do much to save your gym profit.
Dragon is most expensive.
