Evolving Onix into Steelix requires a special item : r/pokemongo

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Steelix 044: Pokemon GO (PGO) – The Pika Stop

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

Pokemon Go Gen 2 -Evolving Onix into Steelix