Well I swear I saw some fruits, so I don't think they'll worry too much about the food.

My prediction is that pokemon world is the alternative world they created in the future. All the people with no social life goes to this pokemon world to get away from the cruel reality in the real world.

Or the real world was destroyed by the terminators and adults sent their kids and few others in the pokemon world so that they won't have to witness blood and death.

Just theories.. Ignore me