Blissey won't evolve.
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evolve your chancey
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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).
There is no Blissy Pokemo on Emerald.Therefore there is no Shiny Stone.
Happiny evolves into chancy evolves into blissy.