You cannot open it until you have the aid of Hercules, and he will not do so right away.
Once you have all 5 sacred objects, you have to bring them to Athena at the Tree of Immortality, where their message can be revealed. Then they will be stolen by Zeus. Now Hercules will agree to help you, and he can move the boulders blocking you from Hades and from Poseidon.
get the five sacred items, give them to Zeus, go to Hercules, and use the mirror to get there.
it is in the temple thing on the third island behind the throne. it is the key for the cave door on the second island.
To open the door, you need to play Blue, blue, green, yellow, yellow, red, blue, green.
Go up to the Dotted Hole door on Six Island and have a Pokemon use Cut the door will open without fail but save after entering
In order to open the warehouse door on Five Island, you will have to collect two passwords in order to open the door. The first one is obtainable from two rocket grunt on Mt. Ember (located near One Island), and a scientist at the bottom of dot hole (located on Six Island).
Place it on the offering stand in Hades throne room.
get the five sacred items, give them to Zeus, go to Hercules, and use the mirror to get there.
The only doors on Mythology Island are at the temples of Hades and Poseidon, and on the Minotaur's lair.
give him ten darchmas
you need a pomegranate from above the sphinx
The door to Hades realm is opened by an offering of pomegranates, which you can find above the creature in the Garden of the Sphinx. The door to the throne room behind Cerberus cannot be opened until after you have gathered all five Sacred Items, and then lost them to Zeus. Then Hercules will help you.
Hercules will not help you until you have collected the 5 sacred items and had them stolen by Zeus. You will need the Touchscreen Mirror from Aphrodite's test on the beach. Transport yourself with Hercules to the Hades door and he will roll back the big rock. He will do the same for the rock blocking Poseidon's throne room.
you get a pomagranet from the garden of the sphinx and place it on Hade's alter at his palace. The alter is by the door. The door will then open.
Go to Hades's temple (right of Main Street) and place them on the altar by clicking "use." This will open the door to Hades' realm.
Go to Hades's temple (right of Main Street) and place them on the altar by clicking "use." This will open the door to Hades' realm.
There are pomegranates in the Garden, just above the Sphinx. Place them on the altar to open the door into the Underworld.
you Have to get Heracules to smash the rock into bits. You will have to get the mirror and transport him there(since he is too lazy)