You can't.It's only obtainable in Fire Red/Leaf Green by catching wild Chansey in Safari zone.You can also get one by doing the Lucky Egg Quest in Pokemon XD:Gale of Darkness.It's far easier to get the egg in XD than in FR/LG.
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If you want a lucky egg,that is to use gamesharkThe steps...1.Go to youtube and type this in the search box,Pokemon Emerald-ALL ITEM on sale!!! (you can just copy and paste from here.The user is smarkoh)2.Go click on (more info) at the description and the cheat is available there.3.Pls rate and comment.***The cheat is for ALL(most) of the items and it only works for emerald
Transfer in a pokémon that is holding a Lucky Egg.
Nothin' hatches from a Lucky Egg......I WISH SOMETHIN' DID!
The only way you can get a Lucky Egg in Pokemon FireRed or LeafGreen is to go to the Safari Zone and catch a Chansey. It's very rare to get one because it's only a 5% chance a Chansey will be holding one. Chanseys are very hard to find, catch, and they always run away. Also if you have Pokemon XD you can get a Lucky Egg by doing a quest and then trading it to Pokemon Ruby, Sapphire, Emerald, FireRed, and LeafGreen versions.
To get a Shiny Torchic the legit way you must be really lucky and hatch a Torchi egg into a Shiny Torchic. However you can get a cheat device and spawn one in the game.