Power Pro Kun Pocket 3 is the third game in the long-running arcade baseball series for hand-helds and the first to appear on the Game Boy Advance. As a whole, it is part of the larger Jikkyō Powerful Pro Yakyū series also developed for the main console systems.
The game includes a Success mode, where the baseball sequences are combined with a larger storyline introducing simulation and role-playing elements. Generally, the aim is to train a weak player to become one of the best, mixed with different intrigues. In this version, the player's character was once a famous high school baseball player who got killed. A doctor resurrected him as a robot and now he needs to go to three stages to regain his status.
The gameplay involves training the character to get drafted with a team, earning money to earn a life-long battery, and acquiring a memory level of more than 80% in the final phase. The player can also engage in mini-games at the former high school, duel rivals, and participate in various events that affect the character's HP, stress bar, and memory bar.
The game features extensive customization options, including control settings for the computer and players, team and player statistics, and a variety of mini-games. Games are played over several innings, with the player taking turns hitting and pitching while following traditional baseball rules.