Have the chansey's happiness be at the max to do that use protein, iron, carbos, hp up, calcium and zinc then level it up while holding a soothe bell it will become a blissey just like that.
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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.
I leveled up chansey to level 37 and forgot to give it a carbos one level before and it did not evolve.
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!
One needs to increase Chansey's happiness to its maximum.