In Generation I
In the Pokémon Project Studio computer design programs, there are various images and templates for birthday cards and invitations.
In Generation I and III
The journals found in the Pokémon Mansion on Cinnabar Island reveal that Mewtwo was born on February 6.
In Generation IV
The description of Gracidea states that it is sometimes given out in bouquets for birthdays.
In Diamond, Pearl, and Platinum:
After defeating the Elite Four, Lucas/Dawn in Sandgem Town will ask the player if it is his or her birthday.
Diamond dust appears in Snowpoint City on January 12, Junichi Masuda's birthday.
In Pokémon Ranger: Shadows of Almia:
It is revealed over the course of the game that on Blake Hall's sixteenth birthday he drove his father, Brighton Hall from Altru.
The Go-Rock Quads rehearse on the grandstand at Altru Park for a performance to celebrate the opening of Altru Tower on Altru's Birthday.
After the ending, Melody asks the player to bring her musical Pokémon to help her perform a song to her brother Isaac for his birthday.
In Pokémon Mystery Dungeon: Explorers of Sky:
One of the personality questions that can be presented at the beginning of the game asks, The people at the next table are singing for someone's birthday. What do you do?
In My Pokémon Ranch:
Hayley's birthday is November 18.
In the Platinum update, a new toy was added for when it's the player's birthday, the Birthday Cake, when activated, confetti falls from the sky around it.
In Generation V
In Black and White and Black 2 and White 2:
The owner of the Pokémon Musical Theater will give the player the Prop Toy Cake.
The nurse in the Pokémon Center will ask the player if it is his or her birthday every time she is spoken to.
The mist on Route 14 and Route 15 will clear. (BW)
In Icirrus City, Aha, Wye, and Ditoh will give a special quiz. (B2W2)
On Pokémon Global Link:
From December 1, 2010 onwards, Japanese players could obtain Togekiss on the day registered as their birthday on the Pokémon Daisuki Club.
From September 1, 2011 onwards, international players could obtain Togekiss on the day registered as their birthday on their Pokémon Trainer Club account.