Wayward Cave. To get there you have to go through and entrance under the bike bridge.
The Cave near Eterna City Cycling Road
To obtain a Gible on Pokemon Pearl and Diamond, go to the secret place at Wayward Cave, which is under the cycling bridge, just walk around till you encounter one! It's not very complexional at all.
Wayward Cave
it will be the female Pokemon
you can get diagla on dimond
Gible is not available in this Pokemon version in the wild. to acquire Gible, you must beat the Elite Four and transfer this Pokemon through the Poke Transfer Lab located on Route 15. You must have Gible in your PC in another Pokemon game used on a DS (Diamond, Pearl, Platinum, Heartgold or Soulsilver.) This is true for all Pokemon you want/need in previous generations.
Gible cannot be caught in Black or White.
wayward cave
in a cave under the bridge by wayward cave on pearl
Wayward Cave on route 216
you cant he is only in pearl, diamond
gible evolve to gabite at level 28 and gabite evolve to garchomp at level 48