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.
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at the Pokemon mansion after obtaining nat dex talk to mr backlot
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.
Jigglypuff is the dual Normal/Fairy-type Pokemon.
because jigglypuff is a Pokemon
A Moon Stone evolves Clefairy into Clefable, Nidorina into Nidoqueen, Nidorino into Nidoking, Jigglypuff into Wigglytuff and Skitty into Delcatty.