The EXP egg in Daryl's tomb.. From that room with the tombstones, go down, then go right down some stairs. You should end up in a room with a stone in the middle of it, stand in front of that stone, then walk towards the bottom wall, so that only your head shows. Then walk right, through the wall. When you can't go right anymore, go up to the chest. The exp egg is yours!

You don't even have to do that THE WORLD IS SQUARE thing.

Uh, to get Tintabars in the Colloseum, bet either a Megalixer or Marvel Shoes.