Pokémon Ruby Version, Sapphire Version, and Emerald Version - Single Battle → Pokémon Ruby Version, Sapphire Version, and Emerald Version - Single Battle Tags: pokemon-ruby-sapphire-and-emerald, battle-system, in-depth-guides, single-battle A Single Battle is a battle with one Pokémon in battle on each side. When a Single Battle starts, the first Pokémon on each side enters the battle.