This answer is only for people who have gotten to the cave in Mt.Coronet where they meet a Galactic Grunt who is lost and has no Pokemon.After battling all the grunts in that cave who do have Pokemon,get out of the cave and you'll notice a full scale of rocks that point to the left.After using Rock Climb,go to any cave you find.Battle all the grunts in that cave and move on until you make it to Cyrus who is in Spear Pillar,where you'll battle against two grunts and Commanders Mars and Jupiter.
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Mt coronet is only in diamond or pearl or platinum not in firered.
Mt Coronet.
mt. coronet and sendoff spring
Well you don't even need it if your playing pokemon platinum
you catch nosepass at mt. coronet