Evolving Onix in Pokémon Legends: Arceus is similar to how to do so in other Pokémon games, but does not involve trading. Here's what to do.
Pokémon Legends: Arceus Archives - VGKAMI
Onyx in Pokemon Arceus versus a recent pokemon game and a five
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How to evolve Onix into Steelix in Pokémon Legends: Arceus - Dot
How to Evolve Onix to Get Steelix in Pokemon Legends: Arceus
How to evolve Onix into Steelix in Pokémon Legends: Arceus - Dot
Pokémon Legends: Arceus Archives - Page 2 of 2 - VGKAMI
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Pokémon Legends: Arceus Archives - Page 2 of 2 - VGKAMI