I believe Greninja break is still an excellent deck and may even get more powerful due to ultra prism. Even though the set didn't exactly give Greninja any new tools to work with, they introduced Alolan Dugtrio, which is a viable 60 hp attacker to a strong archetype gaining popularity. Because of Giant Water Shuriken, It seems like this would be a favorable matchup for greninja on paper, though I am yet to do any solid testing myself.
Would you be able to elaborate on who "spoopy boi" is? I don't quite get the reference, and it would help for others who also want to discuss this topic.