On the first screen grab a Tent then go up.

On the right, Vivi can burn through the wall to obtain an Ether. Pick up the Potion from the chest and go on.

In the next chamber, pick up an Elixir, Potion, and Mage Masher.

On the next screen, get a Leather Wrist and Phoenix Down.

After going up, go left at the fork to meet Mois the moogle. Go back and right to continue on.

The entire party will fall a asleep and only Zidane will wake up. Go forward to fight Black Waltz No. 1 and Sealion.