In order to get the Togepi Egg in Pokémon HeartGold, you will first receive an Egg from Mr. Pokémon that you will have to give to Professor Elm however Professor Elm will have 1 of his aides give you the Egg (which is the Togepi Egg) after you interact with him in the PokéMart in Violet City after beating Falkner, the Violet City Gym Leader.
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For a togepi to evolve you need to give it 220 happiness
he hatches
you get it from an egg in Pokemon platinum
Togepi
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