Lapras is a WATER and ICE type pokemon. Therefore it is weak against ELECTRIC, GRASS, FIGHTING and ROCK type attacks.
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Lapras is a Water / Ice type Pokemon. Therefore Electric, Grass, Rock, and Fighting attacks are super effective (they do 2X damage). Lapras is resistant to Water and Ice attacks (they do half damage), so those aren't good ones to try.
Ghost & Flying. I believe that's it! Not dark or bug because although they're super-effective against Psychic, they are not-effective against Fighting. And not Psychic, because though it's super-effective against Fighting, it's not-effective against Psychic.
Water and Grass attacks are super effective against Onix.
Rock, electric, ice, and psychic types are super effective against Crobat.
Steel is super effective against rock type pokemon.