CATEGORY		DESIGNED FOR
Standard		Beginning Pokemon players OR less ambitious challenge runners
Ultimate		Intermediate Pokemon players OR mildly ambitious challenge runners who don't like resets
Kaizo			Players of any level who prioritize viewers or stream content (clips of unlucky deaths, etc.)
Skill			Advanced Pokemon players OR ambitious challenge runners who don't like resets OR anyone who prioritizes improvement
Master			Anyone who has beaten Skill OR any advanced player who wants a more exciting and difficult endgame than Skill

Master = Skill, but you must beat the second round of the Elite Four