Trade it from Diamond/Pearl/Platinum, or breed a chansey while it's holding a luck incense.
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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.
Mt Coronet.
Happiny did not exist at the time of Pokémon Crystal. Therefore, it cannot be obtained.
The hiker (in Pokemon Diamond, Pearl and Platinum) to find a Happiny will be on Route 210, South Pokemon with Breeder Kahlil.
if you mean the egg that makes happiny evolve, no. happiny didnt exist when fire red came out. plus, its impossible to find a wild blissey in the wild. the only way to get it to hold the egg is to migrate it to Pokemon diamond,pearl,platinum,heart gold, or soul silver and then give it to blissey after you catch it in pal park.