Hello, I'm an expert in the field of Pokémon evolution. When it comes to the evolution of Steelix, it's important to note that Steelix is a pure Pokémon species and does not evolve from or into another species through standard leveling or evolutionary stones. However, there have been some changes and forms that Steelix has taken over the years in the Pokémon games.

In the original games, Steelix did not have any evolutions. However, in Pokémon X and Y, it was introduced as a Mega Evolution for Steelix, which is a temporary evolution that occurs in battle. The Mega Steelix has a different appearance and increased stats compared to its regular form.

Additionally, in the Pokémon Sword and Shield games, there is a new form of Steelix called the Gigantamax Steelix. This is a special form that certain Pokémon can take on in the game's Max Raid Battles, where they become larger and sometimes gain new abilities or appearances.

To summarize, while Steelix does not have a traditional evolution, it has received special forms and abilities in more recent games.

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Steelix (Japanese: �ϥ��ͩ`�� Haganeil) is a dual-type Steel/Ground Pok��mon introduced in Generation II. It evolves from Onix when traded holding a Metal Coat. It can Mega Evolve into Mega Steelix using the Steelixite.read more >>