Hi fellow pandaz
Just been in/on Misty Hill and after e few rounds of "The Ghosts of Misty Hill", I figured that you caught alot more ghosts in a paricular area. This area is near the forest entrance (by the "1864" tombstone), where they go in and out the forest. Normally I catch around 20 Ghosts (Im not very good!!!), butnow icatch about 30!!!!!
You have GOTTA try this out (same as catching bunnies near the bush in the middle of the Darby Field, where they like to hide)