You mean.. Drifloon right? You can find one every Friday at Valley Windwork!
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It is Chatot. You find it in Routes 222 and 224 (morning and day)
IN Pokemon platinum you find this Pokemon on route 201(after you get the national pokedex you put fire red version into your DS)and he will appear.Samething with Pokemon pearl and diamond.
Number 53 on the Sinnoh Pokédex is Combee, you can find it by using Honey on trees.
If you are talking about the Sinnoh Dex, then you will find 47 (Mothim) after you evolve a male Burmy, which you find rarely in Honey Trees with Honey.
in diamond, pearl and platinum it is heracross