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It will appear in Mt. Silver cave.
To get into Cerulean Cave you have to get all 16 badges in Kanto & Johto, beat Red in mt Silver, then talk to Prof. Oak
You can find Absol in "Pokémon SoulSilver" in the Slowpoke Well, the Union Cave, Mt. Mortar, Rock Tunnel, Dark Cave, Cerulean Cave, Mt. Moon, Mt. Silver, Diglett's Cave, Whirl Islands, Victory Road, Rock Tunnel, Cliff Cave, Ice Path and Tohjo Falls or you could get it in a trade. The trick to catching it is to lower its HP and to either use Ultra Balls or Dusk Balls.
in mt silver or any other big cave
You can catch a Misdreavus on Mt. Silver, The Cliff Cave, or the Safari Zone (has special requirements).