Basically, there are a few Pokemon that you don't get in Diamond that you get in Pearl. You get Skunktank in Diamond, Purugly in Pearl (I am pretty sure) Bonsly and Mime. Jr are different, and obviously Diagla and Palkia. There are some differences, but they have the same for the most part. The story line is also the same.
No, a pearl is not a diamond... but it may be in the same family..
same except you get palkia in pearl and dialiga in diamond
Yes. The same way as in Diamond and pearl.
Yes, Pokemon Diamond and Pearl's region name is Sinnoh Region.
the same way on pearl.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
They are both exactly the same except Diamond gets Dialga and Pearl gets Palkia.
Only you can catch some only in Diamond and some only in pearl
It`s the same in Diamond,Pearl,and Platinum:FRIDAY
they are the same.the only difffernce is there is palkia in pearl and digla in diamond i like diamond the best shieldon can be found only in pearl and cranidos can only be found in diamond same as misdreavius and murkrow
My cousin has diamond and have pearl so we showed that there are diffrent story lines hopes this helps
yes its also the same for platinum diamond and pearl, but diamond and pearl do not have a battle frontier