You can get 800/24h from growing and selling the quickest-growing berries, but it's a choice between 1PP/berry fed to someone else's pokemon, the exp when fed to your own pokemon, or selling them for 50 each. Other than that your only options seem to be dungeons, selling stuff to other players, or donating to the site to get special items and abusing them to get money from other players (selling them outright or making it easier for you to get rare pokemon).