it is hard. i`m searchng too. i still havent got one yet. i am searching under cycling road. i havent had luck yet. but i hope you do.
Ok, go up half way below the cycling road, keep going up on every rock under the road until you go in a rock (it may scare you at first, but you get used to it). I have two gibble, one male one female, and the difference is the fin on top. And you search in the back of the cave, were you need the bike most.
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Watch this video copy,paste an search this link The Secret Cave And Where To Get Gible On Pokemon PearlDiamond!!!
No! T_T
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you cant you can only get it in platniumyes you can it is underneath the cycling road you have to cut down a tree to get under it there are two entrances type in :How do you catch Gibble in wayward cave in Pokemon pearl?in this site for more information
gibble is in victory road
The secret entrance to Wayward cave under the bike road. where you catch gibble
Go to the route after Cycling Road, and go north to the place where you need cut to continue. Go on, and soon enough (if you find the hidden entrance), you'll find a cave. Enter that cave, and run around. A Gible will appear once in a while.
you do not find dialga in Pokemon pearl
I think it might be a rare Pokemon so keep looking around the area till you find it
Trade with Pokemon Pearl or Pokemon Platinum
you eat it!