All Rock-type Pokémon weaknesses, explained - Dot Esports

Onix 138/264 Non Holo Common Fusion Strike Pokemon Card NM

Onix (dp1-92) - Pokémon Card Database - PokemonCard

Onix (69/109) [EX: Team Rocket Returns] – Pokemon Plug

Onix - Pokemon

So the internet said SALAMENCE type is weak against on onix type

Pokemon SM Celestial Storm Card: Onix - 71/168 - Reverse Holo - Recaptured LTD

Gym Heroes 1st Edition Brock's Onix 21/132 CGC 6.5

Onix - 69/100 - Common - Reverse Holo - Pokemon Singles » Diamond and Pearl Series » Stormfront - Frontline Games

Onix 69/100 - Stormfront - Game Nerdz

Mavin Onix 56/102 Pokemon Card