Give it an Oval Stone and level it up. An Oval Stone can be found in the Lost Tower (D/P/Pt), the Jhoto National Park as a 1st place prize or Kanto's Rock Tunnel (HG/SS), Amity Meadow (Pokewalker route, 1,500+ steps), the Training Cave (B/W), or a wild Chansey may be holding one (This is a 50% chance possibility on D/P/Pt/HG/SS, but on B/W there's a 50% chance of a wild Happiny holding one)
*NOTE: There are multiple 1st place prizes in the bug catching competition. AND you can only get it after you have the Nat. Dex in HG/SS
Just in case you don't know...
D=Diamond, P=Pearl, Pt=Platinum, HG=HeartGold, SS=SoulSilver, B=Black, and W=White
Credits to Serebii.net
a shiny stone
Brock got his Happiny in One big Happiny family. That is the first episode Brock's Happiny got it's debut. Brock got his Happiny in One big Happiny family. That is the first episode Brock's Happiny got it's debut.
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level it up to level 16
A Lot Of Pokemon Trainers Have Happiny But You Can Also Get A Happiny In A Hearthome City There Is A Hiker Who Will Give You An Egg,And Inside That Egg There Is A Happiny.
You can get happiny in the trophy garden.
Happiny evolves into Chansey.
Happiny can't lay eggs!
Happiny is a Normal type pokemon.
Happiny is a Pokemon from the newest generation, Diamond; Pearl; Platinum. So you cant get happiny in Sapphire
Haunter evolves only by trading to another game.
Lombre will evolve when you use a water stone on it, there is no other way.