put two Pokemon in the day care 1 female 1 male go to the link below to look up egg groups ( who can breed with who ) or catch a ditto ( ditto can breed with anything but legends)
You probably think that this could be cheating, but I don't know about it. Try going on YouTube and type in Pokemon How to Make an egg in Heart Gold. It tells you everything you need to do to make it.
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Transfer in a pokémon that is holding a Lucky Egg.
Wild Chansey
In HeartGold, give a Mantine the Wave Incense and breed it. The egg with hatch into a Mantyke.
You get an egg from Professor Elm's assistant from any Poke Mart.
Deposit one of your Pokemon and you may get the egg