Does armor pen work on abilities?

I had hybrids reds on my sona support page, but someone laughed at me and said why do I have armor pen on an ability champion. But every guide I look at says to use hybrids reds. So is my friend stupid for laughing? I also googled it and one discussion on lol said "Armor pen works on skills too that do PHYSICAL DAMAGE. So Talon and Riven will benefit with armor pen in their skills and their auto-attack."

But my page is for sona. Are hybrid reds pointless? I ended up changing them to just mpen.