You have to let evolve from a Golbat by Level Up with Happiness Value at 220
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you have to give it maxed out happiness
level up your GOLBAT with high happiness.
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
Aerodactyl has higher attack then Crobat, while Cobat is superior in defense. Crobat also learns hypnosis, and is the fastest of any Pokemon to learn it. That being said, it depends on your team.
NO!!!!! YOU CAN ONLY CATCH PALKIA ON PEARL you can't catch dialga on Pokemon pearl but you CAN trade it you only get both in Pokemon platinum