There is currently no concrete evidence that Brock's Happiny evolves at all. However, the penultimate Diamond and Pearl episode's title has been revealed as "Pokémon Doctor - Brock!" and so rumours have started up is some forums that Happiny evolves in this episode and Brock decides to leave Ash to become a Pokémon doctor.
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Brock's Happiny evolves into a Chansey in The Brockster Is In! Which is episode 190 in the Diamond and Pearl series and the 656 episode of the entire show.it aired in the United States on January 29, 2011 and in Japan on September 2, 2010.
Yes. Happinys evolve and become Chanseys. Happiny evolves at episode called "The Brockster is In". Pichu was poisoned and had a fever so Happiny and Brock had to help. In the last second Happiny evolved to save pichu with "Softbroiled". They were at a ship back to Twinleaf. Why does happiny have to evolve. I like Happiny's little body and strength ahh that's why i hate evolution. oh well
you have to have full friendship with it
Not yet but soon he will evolve into Toxicroak after the Sinnoh League if he jabs all the time with Poison Jab.
Only Happiny can evolve with this item. When Happiny holds the oval stone during the day, it evolves into Chansey when leveled up at any level.