You train them
I personally like Emerald better, but Pearl has better graphics.
diamond
its not
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
i reckon PLatinum. it has all the new features but doesnt allow some Pokemon to appear in the wild that do in Diamond/ pearl. but platinum also has even rarer Pokemon that don't appear in pearl/diamond. I have all three. YAY
they are all worth time
Pokemon diamond n pearl it has the recentest Pokemon on and its better graphix
I'm not to smart, but you can't get Trapinch and Pokemon Platinum is better.
You can make it happy by treating it to spa.
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everstone
You can get better ribbons and get a massage for your Pokemon that will raise their freindship.