In regards to Raikou, Entei and Suicune I am not that sure that Inner Focus should be considered completely a nerf, Inner Focus users like Crobat have good success on doubles because its ability to not care in the first turn against Fake Outs, true, if Psychic Terrain becomes prevalent having an immunity against Fake Out may seem redundant, but it also means that they can work well in terrain wars.
For example Raikou with Tapu Bulu could work pretty well in the future, Raikou basically gets no weaknesses and can set up screens, paralyze, snarl much more consistent, especially since Thundurus is somewhat nerfed because the prankster set could struggle in the future(a lot of pranksters could get affected actually), also Thundurus along with Zapdos cannot get advantage of Terrains.
Raikou also blends well with Tapu Koko, as everybody knows A-Raichu seems to be the BF with Tapu Koko because of its ability and Fake Out, but Tapu Koko being the fastest means it will be prompt to lose Terrain Wars, and Raikou could work better outside of Electric Terrain since it also works well with the other Terrains.
The somewhat sad part is that Volt Absorb Raikou would have been better in singles because almost every Elec mon rely on Thunderbolt as its stab, and could also work against Rotom-W Volt Switching, though my main concern is the lack of new tools, Raikou has a great stat distribution and a solid typing, sad its ability and movepool are limited by OU standards, still is a nice candidate for Z-Elec move because of its high speed, Mantine and Pelipper could make Elec mons become a little more popular, and as said previously Terrains means Zapdos and Thundurus could get less usage.
Suicune getting Sheer Cold means that is the most viable user of an OHKO move(because Sheer Cold has no immunities unlike Fissure and Horn Drill and having a good defensive type) in Battle Spot, is not consistent but this could be a nice addition, even if somewhat gimmicky,
also Suicune with Inner Focus can set Tailwinds more consistent, Pressure is better in general for PP Stalling in OU than Water Absorb utility, in fact Suicune is one of the if not the best user of Pressure, not that I did not want for it to get Magic Bounce or Unaware but at least it can take advantage of it.
Entei IMO is the one that really would have been better with its ability, because since it has no use in doubles it means Inner Focus doesnt do anything for it, and in singles Pressure also sucks for it.
Torkoal is definitely seeming to be better than Ninetales as a Drought user, in doubles its 20 base speed means it can work in Trick Room, especially since Eruption under Drought should do serious damage, its defense means it also doesnt die easily by priority when on Trick Room, it also gets Rapid Spin and SR so in general it seems a blessing for Sun teams because of its good role compression.