SEver use the website 'Rate My Professors'? It's exactly what it sounds like—a website where students can rate their professors. It's also not something that exists in the world of Pokemon. But if it did? The most popular pages might look a little bit like these Dorkly comics.
Though you can look at all the comics at this link, here are the two more important ones—Professor Oak and Professor Sycamore. And by "important ones" I mean "the ones you're more likely to know or care about."