Q/Discord: Hello Pickard, you'll never guess what I've been up to lately.
Picard: I don't even want to know...
In my head canon, Q and Discord are the same guy, Discord being incased in stone was what happened after his third encounter with Picard. Being able to do whatever the hell he wants, after being turned to good by Fluttershy he time traveled back and continued messing with the French space captain.
Captain's Log. Stardate 43329.6 Dear princess Celestia, I have discovered the existence of a powerful being who can be a danger to the universe. Thanks to the special habilities of all my crew, we were able to defeat him with a powerful shot of magic.