Pidgeotto is a Normal-Flying type, and as such, it is weak to Rock, Electric, and Ice moves. (These attacks are super-effective, which means they will do double damage). A Pokemon that is one of those types would make those moves even stronger, so a Rock, Ice, or Electric type Pokemon with a signature same-type move should be the best against it.
Pidgeot is immune to Ground and Ghost moves, and resistant to Bug and Grass. It will take normal damage from Normal, Flying, Fighting, Poison, Steel, Fire, Water, Psychic, Dark, Fairy, and Dragon moves.
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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
Steel is super effective against rock type pokemon.