Can Onix evolve without trading?

Is it possible for Onix to evolve without trading?
No, Onix cannot evolve without trading. Like other Pokémon of the same type, Onix’s evolution requires a trade with another player to be triggered. There is currently no alternative method available to evolve Onix without going through this step.
Does Onix’s evolution require a trade?
Yes. Trading is an essential requirement for evolving Onix in every version of the game where it appears. Whether in older games like Pokémon Red and Blue, or in more recent versions like Pokémon Sword and Shield, Onix can only evolve after being traded with another player.
Can you bypass trading to evolve Onix?
No, there is currently no official method to bypass trading in order to evolve Onix. Unlike some Pokémon that have received alternative evolution methods in Pokémon Legends: Arceus or in other recent installments, Onix remains tied to the trading mechanic for its evolution.
oIs there an item that would allow Onix to evolve without trading?
niNo. No item such as a “Link Cable” or an evolution stone allows Onix to transform without being traded. This constraint is intentional and is an integral part of the game mechanics for certain Pokémon like Onix.
Conclusion: Is it necessary to trade Onix to make it evolve?
Yes, unequivocally. If you want to evolve Onix, you will need to trade it with another player. There is currently no other way to trigger its evolution in the official games.