Is onix/steelix good ? Cuz I just got this and was wondering if it's worth powering up and evolving then mega evolving : r/pokemongo

SHINY ONIX EVOLVES INTO MEGA STEELIX in Pokemon GO ! Trainer Ari

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Onix - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN

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Pokémon Esmeralda, Dos cosas: 1. La naturaleza está bien? 2. Que movimientos me recomiendan ponerle? Tener en cuenta que oviamente lo evolucionaré