system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] Why did Professor Oak, a world renowned Pokemon expert tell Ash that there were only 150 Pokemon in the world?
gpt
The same reason we teach children an atomic model that looks like a little solar system - easy to understand. The same reason the periodic table students learn in chemistry often lacks the Lanthanides and actinides:  
Oak presumed that Ash would only encounter those 150 Pokemon and didn't want him to go crazy about those he would not find on his first adventure.