How do you evolve Onix in Black 2?

Pokémon of the Week - Steelix

Pokemon Onix – Pixelmon Reforged Wiki

How To Evolve Onix Into Steelix In Pokemon Brilliant Diamond & Shining Pearl (Metal Coat Location)

How to evolve Onix in 'Pokémon Go' Gen 2: Use the metal coat to get yourself a Steelix

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Pokemon Legends Arceus Onix

After almost 2,000 spins, I finally got a metal coat to evolve my 100% Onyx. Couldn't be happier with the result! : r/pokemongo

Onix (Pokémon) - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat

HOW TO Evolve Onix into Steelix in Pokemon Brilliant Diamond and Shining Pearl