In Eterna Forest, you can find Buneary, Bidoof, Budew, Wurmple and its evolutions, Kriketot and its evolution, Hoothoot, and Gastly. And if you go in the Chateau, you can find LOTS of Gastly, and old man ghost, and a little girl ghost (scary! :O ) and also some weird food thing that your Pokemon can eat to restore status....
AND ROTOM! STOCK UP ON MASTERBALLS
You can't find any Pokemon in Eterna City except for the gym leader's Pokemon (Cherubi, Turtwig, Roserade) but aroundEterna City you can find like Wurmples (any time) and Misdreavus/Murkrow (night) in the Eterna Forest, Gastly (any time) and Rotom (get national pokedex, any time) in the Old Chateau (Eterna Forest), you can fish for Magikarp (any time) and Goldeen (any time) by the fishermen on the bridge, and some Ponyta (any time) and Geodude (any time) by Mt. Coronet.
wurmple
ghastly
silcoon
budew
cascoon
buneary
and there's probably more.
Mukrow can be found at Eterna forest at night.
In Eterna Forest.
Kakuna is in the Eterna Forest only if you have Pokemon LeafGreen in the GBA slot.
The haunted mansion is in the Eterna Forest
Insert Emerald into your DS and go to: Route 203, 204, 229 or the eterna forest
Mukrow can be found at Eterna forest at night.
You can find it in Eterna Forest.
Eterna forest
The Eterna Forest
in the eterna forest
you can get a silcoon either in eterna forest or by evolving a wrumple which as well you may get in eterna forest.
Pokemon Diamond, Pearl and Platinum has Eterna Forest.
In Eterna Forest at night.
eterna forest with pokeradar
In the north of Eterna Forest.
Get an Eevee and level it up in the Eterna Forest.
Buneary can be found in Eterna Forest.