You can get a Happiny egg by going to Hearthome City and going all the way to the bottom then all the way to the riqht and talk to the fat guy and he gives you the egg have an open spot for it though.
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You find it in the Pokemon mansion. I'm not to sure but that is the place to find Happiny in diamond and pearl.
The hiker (in Pokemon Diamond, Pearl and Platinum) to find a Happiny will be on Route 210, South Pokemon with Breeder Kahlil.
Happiny is a Pokemon from the newest generation, Diamond; Pearl; Platinum. So you cant get happiny in Sapphire
Cynthia Has A Happiny Go And Talk To Her?? wrong. Cynthia gives you a happiny egg in pearl and diamond. in platinum, it is togepi
Trade it from Diamond/Pearl/Platinum, or breed a chansey while it's holding a luck incense.