Happiny is a 4th generation Pokemon none of those Pokemon existed in previous generation games like leafgreen.
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Happiny is Generation IIII, and LeafGreen is Generation IIII.
A Lot Of Pokemon Trainers Have Happiny But You Can Also Get A Happiny In A Hearthome City There Is A Hiker Who Will Give You An Egg,And Inside That Egg There Is A Happiny.
Happiny is a Pokemon from the newest generation, Diamond; Pearl; Platinum. So you cant get happiny in Sapphire
Happiny can be recruited in Happy Outlook.
You find it in the Pokemon mansion. I'm not to sure but that is the place to find Happiny in diamond and pearl.