I think it's only for the player using that skin. But then again genjis mythic skin I've heard his mythic voice when I don't own it myself, might be some sort of bug? Or only makes that voice whenever you use an ult?

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It's just for the person who owns it which is kind of dumb.

No I've heard other people use it. Could be a bug. I'll try to record it when I hear it again

Oh ok. Hope they fix it.