Get the Eevee from Bill in Goldenrod city and give it a water stone.
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Vaporeon is a Pokemon... Pokemon are not real things.... so no vaporeon is not real...
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
Yes, many other Pokemon can breed with Vaporeon. So many that I cannot type them all here. (Well I could but I just don't feel like it). But you can find all the Pokemon breedable with Vaporeon on www.serebii.net. Just look up Vaporeon and scroll down to the very bottom and look at Egg Groups. It shows all Pokemon Breedable with Vaporeon.
They are not in Pokemon HeartGold