Happiny evolves into Chansey with it, but she has to hold it and be leveled up during the day. (night doesn't work).
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Happiny evolves into Chansey. It evolves with a oval stone in the day
weedle it evolves into weelord trust me it works
the oval stone evolves hapinee give it to it (dont use it on it) and level up a few times
Level up a Happiny in daytime while it's holding the Oval Stone and it evolves into Chansey.
The Oval Stone evolves a Happiny into Chansey however it needs to be leveling up while it's holding the Oval Stone during the day time.