Zubat
Most Pokemon players know Zubat as the annoying Pokemon who gets in the way in a cave. But Zubat is not that. All Pokemon  appear in the wild. Nobody catches Zubat, except if it's the lucky 1/8094 chance of being shiny, or for the pokedex. Zubat live in caves, with rock types, their weakness. When Golbat evolve with friendship, they think they found a true friend, and they want to be the best they can for them. Most times, it's just for the pokedex, and they get put in the PC, betrayed that their one true friend abandoned them. And Crobats are really strong. I should know. I have 8. And I use them all. Those were the few lucky Zubats. The rest are unlucky, starving and being crushed by rock Pokemon in their cave habitat.