Each day, if you talk to Mr. Backlot in the mansion south of Hearthome, he'll say there is a certain Pokemon there. For the next two days, that Pokemon will appear randomly in the trophy garden. Igglybuff is one such Pokemon.
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In the trophy garden its a daily Pokemon :D
National Dex: Igglybuff Sinnoh Dex: Togetic
in sinnoh dex it is togetic but in national dex it is igglybuff
you need to get max happiness then it will evolve. this usually happens around level 18
You can only get it from breeding it from Jigglypuff or Wigglytuff