Boss

Boss has several referrals:

• Giovanni, the leader of Team Rocket, who uses the Boss and Rocket Boss Trainer classes in the games and is referred to as "the Boss" by Team Rocket in the anime
• Madame Boss, the former leader of Team Rocket
• Subway Boss, a Trainer class for leaders of the Battle Subway
• Boss Trainer, a Trainer class for section leaders at the Black Tower or White Treehollow
• Cyrus, who uses the Galactic Boss Trainer class in the games
• Lysandre, who uses the Team Flare Boss Trainer class in the games
• Guzma, who uses the Team Skull Boss Trainer class in the games
• Bosses, in Bulbapedia's Appendix, as a generic video game term for certain special opponents