During battle, the player may fight, use an item, switch their active Pokémon, or flee (the last is not an option in battles against trainers).
All Pokémon have hit points (HP); when a Pokémon's HP is reduced to zero, it faints and cannot battle until it is revived.
If the player's Pokémon defeats the opposing Pokémon (causes it to faint), it receives experience points.
After accumulating enough experience points, it may level up; most Pokémon evolve into a new species of Pokémon when they reach a certain level.
Additionally, the games can be connected to an e-Reader or other advanced generation Pokémon games.
Ruby and Sapphire received mostly positive reviews, though critics were divided in their assessment of the games, especially on the gameplay and graphics.
Both Pokémon and their moves have a Condition, which is increased by using Pokéblocks (candies made from berries).
Secret bases were added as a one off feature where players could open up a hole in the world and customize the place with various items picked up in game.
Apart from battling, capturing Pokémon is the most essential element of Pokémon gameplay.
During battle with a wild Pokémon (other trainers' Pokémon cannot be captured), the player may use a Poké Ball on the wild Pokémon.
However, they were still critical and commercial successes; with around 16 million copies sold according to IGN, they are the best-selling games for the Game Boy Advance.