You can find Chansey in the Safari Zone in Fuchsia City. Though, it is incredibly hard to find. It is a about a one percent chance to find it.
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you need to find a Pokemon with sweet scent then go to safari zone go to last grass before you can get the surf then use it find a chansey if you find chansey when using sweet scent try catch easily
Since you can't catch chansey you need to trade one from firered, leafgreen or Pokemon xd gale of darkness.
First you need a chansey which firered and leafgreen can get then to evolve chansey it needs max friendship with its trainer it will then evolve to blissey.
Its is fairly rare and the only place I have seen and caught it was in the Safari Zone. Be care it flees very quickly.
The only way you can get a Lucky Egg in Pokemon FireRed or LeafGreen is to go to the Safari Zone and catch a Chansey. It's very rare to get one because it's only a 5% chance a Chansey will be holding one. Chanseys are very hard to find, catch, and they always run away. Also if you have Pokemon XD you can get a Lucky Egg by doing a quest and then trading it to Pokemon Ruby, Sapphire, Emerald, FireRed, and LeafGreen versions.