I leveled up chansey to level 37 and forgot to give it a carbos one level before and it did not evolve.
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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.
Chansey > level up with max happiness > Blissey
Chansey will evolve into Blissey when its friendship is high enough.
chansey does not evolve by level. it evolves by happiness. i hope this helped!
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.