I've always liked Discord.

The Queen of the Changlings outperformed every character is a villain or has a mean demeanor.

Theres no competition. Chrysalis had the longest show time, had an epic song, has her own personal army. You can't top that!

*my opinion*

I can't choose between Discord and the Queen. I hope in the third season they work together against the mane six cause that would be amazing!

the Changlings reminded me of the Agent Smiths from The Matrix!!!!
only reason Ironwill is a antagonist beacause he's the one who made Flutty super duper nasty. other than that he's just a "role model" celebrity and i could thing or 2 from him. im a little of a doormat myself

YES, you guys!! Yes! You're right on about her!
I hope for a Chrysalis and Discord alliance, too. How wicked sweet would that be!!! >:3 Two villainous antagonists with quite different tactics, motives, and goals, but both very brilliant, fascinating, and genuinely threatening, with a taste for widespread domination.
Season 2 opened and closed with the introduction of some of the most unique and awesome villains I've seen anywhere in a long time. This show never ceases to astound me.

It's true that Iron Will isn't really a bad guy. Again, I felt that it was wrong for him not to even receive an explanation as to why Fluttershy was dissatisfied with his services and wanted a refund. He deserved to know the truth.

But I'm a huge fan of Parasprites (related to Tribbles, lol), Nightmare Moon, the Flim-Flam brothers, Silver Spoon, Gilda, the Windigoes (very clever play on Wendigoes), and the teenage dragons as well.

8DDDD

In terms of being a good antagonist, as in doing well at being an antagonist, I gotta go with Diamond Tiara, since she is the only reccuring antagonist. (I'm not even gonna try to explain the Cloudsdale bullies, because their second appearance was in a flash-back, which does not count!)