Jigglypuff can be found in the Trophy Garden on a day where the owner of the mansion tells you that he saw one.
It may take a few days, but it will eventually happen.
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Sorry but you can't get jigglypuff in Pokemon pearl. You should trade with someone who has soulsilver or heartgold or you can buy soulsilver or heartgold.
at the Pokemon mansion after obtaining nat dex talk to mr backlot
you do not find dialga in Pokemon pearl
You can find a few on route 3.
You can only get it from breeding it from Jigglypuff or Wigglytuff