1) What do you have to do at the ruins on Seven Island?

Yes there are unknowns in the ruins

Exactly. All you do there is catch the 28 Unowns.

There are Unknowns there but you have to unlock them to get them. Here what you do. Before you went there there should have been a cave on the left of the screen. If didn't find it look for it carefully. Then you slove the puzzle by putting the on the holes I think. Then once you done that go back to the ruins and there should be unkowns.

If there is a island called Liptoo then yes unknown are there.

Yes, there are unowns in there after you've unlocked the chamber.

You can only catch Unknowns there nothing special to it.

At the ruins in the Seven Island you have to put these rocks together in a cave

Yes there are unknows in there.

First you have to do the tanoby key thing.To do the tanoby key you must find a cave while you walk down the canyon on Seven Island and then go in the cave and push the boulders with Strength into the weird spots on the floor and then if you complete that go into any of the chambers that you want and than you can catch unknown.

In Tanoby Key, push the boulders into the slots and the chambers will be open. In there, there are Unowns.

I think there are Unknowns there.