I don't think it's in Kanto. only in johto
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kanto
Go to Kanto and go to Route 8 a pokemon with cut will be needed and you will probably have better luck finding one at night
you finish the game with heart gold then you go to kanto and you defeat gyms and on the way you'll get zapdos moltres mew mewtwo an so on
after you complete the Pokemon league and go to the kanto region, a snorlax should be found blocking one of the paths. just play the game and obtain the item that wakes it up for a chance to catch it ;] (if heart gold is the same as gold)
if you mean the place where you catch kyogre and rayquaza, route 47 after receiving kanto starter showing it to mr Pokemon and getting the blue orb