@brose SO under the opening post
here, you will find a section titled "Current Locations!".
There are currently two locations and the post lists the types your character will be able to find there. Any Pokemon that matches those types can be found/seen by your character, but he/she will only be able to catch first tier Pokemon (Pokemon that are in their basic form and can evolve).
There are no locations planned for ghost Pokemon as of yet, unfortunately. Haha are you planning on nabbing that Pokemon in your avatar ;) Locations are made by users who have accumulated 10CP through posts, and our resident GM has only made one place--Central City--for us to start off at. You could always save up 10CP and make your own location. Further info about CP (Creative Points) is found in the opening post as well.