In order to evolve Happiny, you need to give it an Oval Stone and then level it up during the day and that will cause it to evolve into Chansey.
Happiny
With an oval stone, you can evolve Happiny into Chanssey.But, you need to make Happiny hold that stone and then level it up in order to evolve.
You can evolve Happiny into a Chansey if Happiny is holding the oval stone and leveled up during the day.
happiny
happiny into Chansey
just happiny
I believe that it is happiny
Happiny, but she has to hold it.
haPPINY
Only happiny.
Happiny, into Chansey.
let happiny hold the oval stone and train it one level and it will evolve