Professors' aides/Games/Sinnoh

In Generation IV, Professor Rowan's aide will always be the alternate gender player character from the player. That is, if the player chose, will be the aide, and vice versa. The aide will live in Sandgem Town with his/her little sister, grandfather, and father—who also works as an assistant of Professor Rowan. The aide is already the Professor's assistant at the beginning of the game. The aide will also demonstrates to the player how to capture Pokémon by capturing a wild, before giving the player five s. On , the aide will give the player a Pokétch app , and the Vs. Seeker. In Veilstone City, the aide will have their Pokédex stolen by a, but gets it back with the help of the player, as well as Looker in Platinum. The aide can be seen at different stages of the game, usually following Professor Rowan around. At the end of the game, the aide can always be found outside Professor Rowan's lab in Sandgem Town, usually giving out pieces of advice. If the undefined speaks to the aide when his/her birthday on the Nintendo DS calendar matches the current date, he/she will ask if it is the player's birthday.

In addition, the aforementioned aide's father will also appear in various parts of the game. He will first be seen in, giving the player an Exp. Share if 35 or more Pokémon have been registered as seen in the Pokedex. He will also appear on, upgrading the Pokédex and allowing the player to view gender and form differences.