>>21135932Snubbull appears only at Route 38 with a 1% encounter rate. That's right, 1%.
http://bulbapedia.bulbagarden.net/wiki/Johto_Route_38Misdreavus appears only at Mt. Silver, only at the second floor, only at night, and it has a 10% encounter rate.
http://bulbapedia.bulbagarden.net/wiki/Mt._SilverAnd I never found either back in my Silver days.