If the previous suspect tests have been any indication, it's just the suspect ladder that you need the COIL req on.Question: Is it for only the OU (Suspect) ladder or for both OU and the OU (Suspect) ladder. It's done differently a lot so I'd like some extra clarification please! n__n
Edit so this isn't a one liner:
Since we all know what the alien viruses can do, let's take a look at how the rest of the metagame might be affected should they go.
There are still plenty of viable hazard layers around, e.g. certain Tyranitar sets for rocks and Ferrothorn or Klefki for spikes. Most teams that heavily utilize them (mostly HO, but other teams can as well) would look to one of these mons for that role. The latter two don't really change much to fit into these roles tbqh, so those playstyles will still be viable.
Hazard control users might see a drop in use but as I mentioned, there will still be hazards around. Bisharp probably won't change much, but he will get new teammates.
Of course, there are other things they can do besides hazards. D is arguably the best wall in OU right now, and we all know how fast S is; it can go offensive (which is its best set imo) and even RK Talonflame with E-speed, despite the seeming overkill on gotta-go-fast-ness. D can handle unboosted TF as well. If the aliens go, I can see TF being even harder to wall than it already is.
Overall, the biggest change I could see is Talonflame running rampant, but not much else changing much. I'm actually undecided at this point; I'll head onto the ladder and see what happens.