Can you still evolve Slowbro into slowking while slowbro is holding a king's rock while trading?

Question

I am asking because one of my friend's way back in the past during an earlier generation of Pokemon said he got his slowking by trading a slowbro while it was holding a king's rock.

Comments

No, Slowpoke can either evolve into Slowbro at level 37 or into Slowking by trading Slowpoke holding a King's Rock. Both Slowbro and Slowking are the final evolutions of Slowpoke.

Answer 1

No. Slowbro and Slowking are the final evolutions of the Slowpoke. One cannot evolve into another.
Slowpoke evolves into Slowbro at level 37.
Slowking evolves when a Slowpoke is traded while holding a King's Rock (it won't work with Slowbro).

Comments

You, basically, copied my comment as an answer.

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You should have answered instead of commenting.

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The information s/he wants is specific. There is only one answer with one explanation. If he asked something broad, like how to beat a certain boss/trainer, and I had the exact same thing as your comment, then it would be copying.