2x Effective
Electric
Grass
0.5x Effective
Water
Fire
Ice
Steel
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Since milotic is a water type, it is weak to grass and electric type moves.
Water and Grass attacks are super effective against Onix.
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.
super effective is bug
psychic pokemons and attacks are super effective