An Easter Egg is an intentional hidden message, inside joke, or feature that is concealed in the game, and there are quite a few within PMU. Some of them are listed below.
In Grassroot Town there is a flower field made to resemble the Triforce from The Legend of Zelda. An NPC named Navi sits there as another obvious Legend of Zelda reference, specifically for the game Ocarina of Time.
CognitoThere is a hidden area in Tanren City Plaza called Cognito. This is a pun on being "incognito," meaning undercover.
There are several signs in PMU with little jokes on them.
- A sign located Northwest of Snowbasin Town has "Sigh...n" written on it.
- There are two signs located North of Grassroot Town. One points to the other and says, "This is a sign." while the other says "This is not a sign."
- A sign far north of Tanren is a sign taken out of the Sinnoh games and says: "WARNING! 5/10 Pokemon faint from reading signs every day! .... and 1/1 of these signs were pure fabrication."