You go to Mt.Coronet/Spear Pillar. You'll need HM Strength, HM Rock Climb, HM Surf, HM Rock Smash.
Go to Eterna City, walk into the cave. Surf across the water, then use Rock climb to get to the door. Just follow your way through. When you reach Spear Pillar, save. Then walk, Double Battle with Rival against Mars and Jupiter and then battle Cyrus, then follow into the portal. You can take it from there.
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