You need to use the move Rock Smash which you get in Mauvile City.
wayward cave
you go to the cave where oreburg gate go up break the rocks and go from the stairs go down see at the right side will see a poke ball on the floor break the rocks at your right and go that place and take it. you will need in the cave near the cycling road exit. --- Alternatively, you can go to Veilstone City's store, go to the 4rd floor and buy it (TM70) for 1000 pokedollars
You can get the TM28 (Dig) on Route 214 in the Ruin Maniac Cave in Pokemon Diamond.
"you" cant
Restore it by fossil when you break rocks in the Glittering Cave
You need to use the move Rock Smash which you get in Mauvile City.
turn back cave
You cannot find the Pokemon Darkrai in Turnback Cave in the game Pokemon Diamond. Instead you can find him in Newmoon Island.
I beat the league on Pokemon Diamond version, and there was no cave involved, if that's what you were asking.
It's found in the cave north of Jubilife City. Go left and break the boulders, you should run into it.
She is in wayward cave.
wayward cave
you go to the cave where oreburg gate go up break the rocks and go from the stairs go down see at the right side will see a poke ball on the floor break the rocks at your right and go that place and take it. you will need in the cave near the cycling road exit. --- Alternatively, you can go to Veilstone City's store, go to the 4rd floor and buy it (TM70) for 1000 pokedollars
You can't catch a Lugia anywhere in Pokemon Diamond.
You can get the TM28 (Dig) on Route 214 in the Ruin Maniac Cave in Pokemon Diamond.
you can get it from fire red in cerulean cave in mirgrate it to diamond