There are over 100 unique trainer classes between all the different Pokemon Gens. Some classic, reoccurring trainer classes for example are Youngster, Lass, Hiker, Beauty, Bug Catcher, Fisherman, Ace Trainer, School Kid, Veteran, Swimmer and Bird Keeper, but there are many more, including some unique game specific classes.
There are athletic classes such as Cyclist, Jogger, Black Belt, Boarder, Skater, Golfer, Bodybuilder and Athlete
Music themed classes such as Singer, Guitarist, Musician and Idol
Occupation themed classes such as Rail Staff, Police Officer, Waiter/Waitress, Pilot, Painter, Nurse, Janitor, Gardener, Fire Fighter, Artist and Actor
There's even some more obscure ones like Ninja Boy, Super Nerd, Pikachu Fan, Tourist and Psychic
What Pokemon Trainer class do you think you would be? Here's a complete list of the different Pokemon classes across all Gens:
https://m.bulbapedia.bulbagarden.net/wiki/Category:Trainer_classes
by Hsiang7