eh I just think Slowking is more replaceable, whereas Skuntank is in a league of its own. Entire teams can be invalidated due to a weakness to trapping, a phenomenon that's hardly unique to DPP NU, and Skuntank is just miles ahead of any other option in the tier.
Depending on the team you can often replace Slowking with a similar mon and may not even need to shift another mon to compensate for the change. I mean, notably, Regirock itself is such a good special sponge at this point too that Slowking has become less essential for checking fires, though obviously there's nothing wrong with running the two together so long as the rest of the team makes sense with it.
But there are teams where replacing Slowking with Politoed or Mantine will most definitely improve the team because the weakness to Skuntank is a problem. (Or frankly teams that forgo a water type at all, and just rely on Regirock.) It's a lot harder to think of teams that have a Skuntank on them that are improved by replacing the Skuntank.
I think a similar argument can be made about Regirock and I would also rate Regi above Slowking, though there at least have been phases in the past where Cradily was considered more on par with Regirock than it is today.
Depending on the team you can often replace Slowking with a similar mon and may not even need to shift another mon to compensate for the change. I mean, notably, Regirock itself is such a good special sponge at this point too that Slowking has become less essential for checking fires, though obviously there's nothing wrong with running the two together so long as the rest of the team makes sense with it.
But there are teams where replacing Slowking with Politoed or Mantine will most definitely improve the team because the weakness to Skuntank is a problem. (Or frankly teams that forgo a water type at all, and just rely on Regirock.) It's a lot harder to think of teams that have a Skuntank on them that are improved by replacing the Skuntank.
I think a similar argument can be made about Regirock and I would also rate Regi above Slowking, though there at least have been phases in the past where Cradily was considered more on par with Regirock than it is today.