Obtained: Beginning

The default application on the PokeGear. It shows the day and time as you enter it at the start of the game. This can be changed in Gold and Silver but only through a contrived process. To adjust for daylight savings time, go talk to your mom in New Bark Town.

Obtained: Guide Gent in Cherrygrove City

A more high-tech version of the Town Map from Pokemon Red and Blue. In its 16 colour glory it shows you the locations of the different cities, landmarks, and routes in the region you're exploring.

Obtained: Beginning

One of the most popular features of the Pokegear is the phone. Useful characters and trainers in the game will give you their number and sometimes call you to pass on important information or tell you how their Pokémon are progressing. Some will often call you for a rematch. You can only store 10 numbers in its memory and it can't be used in caves.

Obtained:
Goldenrod Radio Tower, front desk.
Lavender Radio Tower (EXPN Card)

An interesting application. While it does nothing to advance the story, it is fun to play around with and can affect how Pokemon appear in the wild. Use the slider to change the frequency and scroll across stations.