It really depends on the Chansey's nature/what type of contest you want to have it in. Try serebii.net to find what natures like what poffins and what poffins improve which contest. I use it and it works well :D
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you feed it dry poffins.
You can feed any amount of poffins until all of their status (cool, beauty, strength, cute, smart) is at the highest level.
feed it carbos and sutff
feed it dry poffins. but make sure the poffins are levels 30 or so or it wont work. when it wont eat any more level it up. if it doesnt evolve then the poffins were too weak
JUST FEED YOUR POKEMON MORE POFFINS AND DECORATE IT W/ MORE EERIE THINGS AND FLUFFS JUST FEED YOUR POKEMON MORE POFFINS AND DECORATE IT W/ MORE EERIE THINGS AND FLUFFS