Geodude, Dunsparce, Zubat and some water pokemon.
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They can be found in the dark cave but they are rare.
some times you can catch Dunsparces there
Wobbuffet can be found at Dark Cave, which is at the entrance of Route 45.
You can get Horsea in Dark Cave or Whirl Islands. You'll need to Surf on water to get it.
You have to go to the top of Bellsprout Tower and defeat the elder, in which you will get the item Flash. This move allows you to light up any dark cave.