Spheals can only be found in Pokemon Pearl on routes 226 and 230 (surf), but you might have to get the national dex first.
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you cant. But you can get it in peal and trade it to diamond.
ya get him in veilstone i think
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
you can't catch sealeo but you can catch spheal in rt. 30
You cannot catch Raikou in Pokemon Diamond and Pearl. To get Raikou in Pokemon Diamond and Pearl, you must trade for one from Pokemon HeartGold and SoulSilver where it can be caught or transferring from Pokemon FireRed and LeafGreen.