You ask Hoofingold if he knows anyone who can help you procure some medicine for Autumn Skies.

Hoofingold: "Not anyone I haven't already spoken to, that is. Remedy Breeze, our local pharmacist, imports most of her supplies from the very same apothecary I just mentioned. No luck there, as you know.

That being said, I was told that the apothecary needed only a few more days before the next batch would be ready. If there's any way to speed things along, I suppose that's where you'll find it.

Here. Just in case you find yourselves in Ponyville, you can have these directions to the place, and a few bits to pay for the medicine, should you chance upon it."

The stallion offers you a scroll with directions to the Ponyville apothecary written on it, and a small clinking pouch of bits.

You get Directions to Ponyville Apothecary, and Medicine Payment!

Apple Basket: "Anypony else we can try talkin' to?"

Hoofingold: "Hmm... well, it's a kick in the dark, but in recent years, I've heard that a mysterious alchemist has taken up residence somewhere in the northern parts of the Everfree Forest."

Moonflower: "Oooh! In the forest?"

Hoofingold: "Indeed! Now, I don't quite recall who I heard it from, and I can't imagine that someone who goes out of their way to live there, of all places, would be too fond of visitors, but it might be worth a try.

In any case, there's no sense in blindly searching around an enchanted forest for a house that may or may not be there. Perhaps somepony else knows more about that one than I do, though whether that brings us any closer to a cure is anypony's guess."