Happiny

Diamond: It loves round white things. It carries an egg-shaped rock in imitation of CHANSEY.

Pearl +2: It carries a round, egg-shaped rock in its belly pouch and gives the rock to its friends.

Platinum +4: It likes to carry around a small rock. It may wander around others’ feet and cause them to stumble.

HeartGold +3: It carefully carries a round, white rock that it thinks is an egg. It’s bothered by how curly its hair looks.

Sun: It carries a round white rock in its belly pouch. If it gets along well with someone, it will sometimes give that person the rock.

Moon: It’s too small to lay eggs yet. As a surrogate, it searches out round white stones.

Ultra Sun: Usually it’s a well-behaved Pokémon, but if you take its round rock away, it will cry and fuss and throw a big old tantrum.

Ultra Moon: When it sees something round and white, Happiny puts it into the pouch on its stomach. It sometimes becomes overloaded and can’t move.

Sword: Mimicking Chansey, Happiny will place an egg- shaped stone in its belly pouch. Happiny will treasure this stone.

Shield: Happiny’s willing to lend its precious round stone to those it’s friendly with, but if the stone isn’t returned, Happiny will cry and throw a tantrum.

Legends: Arceus: In imitation of Chansey, it keeps a round stone tucked into its belly pouch and cherishes it dearly. It gets along well with children and will sometimes play house with them for fun.