Gym Leaders are the highest ranking member and owner of an official Pokémon Gym. A Gym Leader will usually
Gym Leaders by GreatMik
specialize in one specific type of Pokémon, and uses them to test the skills of trainers that challenge them. Every Gym Leader holds a unique badge for the trainers that prove their skills to them or defeat them in battle. When a trainer has a total of eight badges, they can compete in their regional League or challenge their region's Elite Four. There are a total of eight Gym Leaders in each region.

As shown several times, a Gym Leader is usually well involved with their community. When not at the Gym, a Gym Leader is usually involved in some type of work or service that the surrounding community is known for. When at the Gym, a leader will maintain the Gym itself, the Pokémon, the other members, and battle any challengers.