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.
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Actually, Happiny doesn't have to level up in order to evolve into a Chansey. You have to make it hold an Oval Stone first. Then Give Chansey a shiny stone to evolve it into a blissy. ------------------------------ Chansey evolves when you befriend it (not by a stone).
chansey does not evolve by level. it evolves by happiness. i hope this helped!
Wild Chansey
One needs to increase Chansey's happiness to its maximum.
Chansey > level up with max happiness > Blissey