you have to pass through a part of victory road on the main floor to the west but not before defeating the pokemon league
you have to beat the elite 4
it leads to another section of the cave, which exits on route 224
you go through victory road and find a little cave entrance inside. go inside and keep going until you get outside, that is route 224
It is on Route 224
On route 224 with the pokéradar.
you find them on route 224
Get Regigegas from the giveaway and go into the cave on route 224
You can't access Route 224 until professor Oak upgrades your Pokemon. Then go east of Victory Road. Route 224 is the eastmost Route in Diamond Pearl and Platinum.
you have to catch a duskull on route 224 and raise him to get dusclops
Once you have the National Dex, the person blocking Route 224 in Victory Road will have moved.
go to route 224 . it is in the caves little pond.
route 224