What are you talking about? Pearl Jam is pop rock? Pearl Jam is way more punk than AIC or Soundgarden. Who are metal. Pearl Jam has way more grunge credentials than most bands as Ament and Gossard came from Green River to MLB and then Pearl Jam.
GRunge evolved from Seattle Alternative rock, which is why AIC and Soundgarden are roped into it. It really was heavily based on Sub Pop records. There's nothing that says Grunge = punk. Especially since everyone calls Neil Young the godfather of grunge and he's not punk. If you're gonna look for 2 genres to blend it's punk and metal. While it has lyrical tendencies of punk. It's way more melodic. Nirvana who's probably the closest thing to punk for a big grunge act, still isn't punk, Compare them to the Sex Pistols, they're slower, more melodic, and more. Other grunge acts like AIC and Soundgarden have barely any punk influence. If you listen to Junkhead, Would or Rooster, do you hear any punk in them? If you listen to Spoonman, Black Hole Sun, or Outshined do you hear any punk in them?
Lol pearl jam is pop rock.