As far as I Know Chansey is not on the Pokemon Sapphire you can trade it from other versions like fire red or leaf green
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The strongest Pokemon Sapphire in the safari zone are Heracross, North east, Dodrio North West,Lairon North West,Pinsar North West,Pikachu North East and North west, Chansey you can find everywhare.
Once you obtain the Sapphire in Dotted Hole a scientist will take it from you then tell you the 2nd password for the Rocket Warehous which is Yes nah Chansey.
Happiny evolves into Chansey. It evolves with a oval stone in the day
Chansey > level up with max happiness > Blissey
One needs to increase Chansey's happiness to its maximum.