Head toward the tent and check the wooden crate on the right side covered by a tarp for a Lemon Gel and then check the crates on the left side of the tent for an Elixir . As your turn around and head for the path to continue through the area check the barrels to the left for a Pineapple Gel and then continue on.
Hop down into the valley and then hop down again at the opposite end and stop to check under the leaf on the right for Noel , gaining Noel’s Collar as well.
Continue through the Central Region of Fezebel Marsh, which has no treasures, and enter the West Region.
As you head along the path make sure to hug the right side so you’ll see the “Check” on some rocks, netting you a Golden Frog Egg . At the dead end open both chest to get a Silver Guard and Big Horn before leaving the Marsh.