Chansey may rarely be found on Routes 13, 14, and 15, which are found east of Fuchsia City in Kanto. Kanto can only be accessed after beating the Pokemon League.
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In Pokémon HeartGold, you can catch Chansey in Routes 13, 14 and 15 and additionally you can catch it in the Johto Safari Zone after placing 12 Plain Objects in the Meadow area.on the pokemon radio pf oak and mary will say where it can be found
To get a Lucky Egg in Pokemon HeartGold (This goes for Pokemon SoulSilver as well), you must find a Chansey in the wild that is holding it. Chanseys are hard to find in Pokemon HeartGold and SoulSilver so you'll have to wait and listen to Professor Oak's Radio Show to know if it is in swarm (Meaning you can find a lot of them on the certain route Oak's Show told you about). To know for sure if a Chansey is holding a Lucky Egg, have a Pokemon that knows the Ability "Frisk", such as a Stantler. Put it into the first slot in your party. When you go into battle and encounter a Chansey, "Frisk" will tell you what it is holding. If nothing happens, then that means Chansey isn't holding anything.
Chansey evolves when you increase its happiness. So beat loads of Pokemon with it without fainting, and give it loads of berries that increase its happiness. Good Luck.
Wild Chansey
Happiny evolves into Chansey. It evolves with a oval stone in the day