you have to make happiny happy and wait until he takes the oval stone you make pokemkon happy by giving them zinc and things that increase there hp and stuff,you also make them happy by walking withe it and massaging it and leveling it up at day or night sometimes they take a long time to become happy. my riolu got happy and evoplved into lucario. you get happiny wild by Pokemon mansion or egg from hiker in hearthome city.you get riolu from iron island walk through iron island with riley and when you beat galactic grunts riley will give you the egg and you walk 6,391 steps for riolu to hatch.
Hope i helped :)
PS whats your starter!?
i have all three
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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.