After you catch every single Pokemon on the national dex and the sinnoh dex. You can always shoot for the 100 strait win at the battle tower, defeat the master rank Pokemon contests, look around for people you might have not battled yet.
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The tunnel on top the ruins is accessible.The tunnel is where you catch the ? and ! Unown.
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 catch makuhita in the fighting area in Pokemon diamond
How do you get a cherrim in Pokemon diamond.
Nosepass is a swarm Pokemon on Pokemon diamond