I'm just gonna say, 4mss is a very big issue for it as darkrai can't always hit what it wants to especially if its rocking nasty plot. If it runs trick it gives up coverage, if it runs nasty plot it gives up coverage, if it runs thunder or focus blast, it cannot always land those moves, point being it has a ton of tools but wants to use all of them in one set, some of which like focus blast and thunder have a very frequent tendency to miss. Point being, if we somehow ban tera, there is a chance Darkrai could be managable in a non-tera meta since it would have a harder time bypassing its 4mss and pokemon like Kingambit would be able to deal with it. (Since gambit in a non-tera metagame is probably fine to have around.)There's also arguing about whether Darkrai should be allowed into OU (absolutely not, imo, but smart people have argued otherwise).
To iterate, I'm not sure if anyone else mentioned it, but Darkrai gets Trick, which is something that allows Choice sets to ruin many of Darkrai's best answers. Blissey, Clodsire, and Toxapex are all ruined by being tricked a Choice Item, and Kingambit also loathes being Choice locked. Even if Darkrai can't answer everything in one set, it has ways around most of its answers, and this is one of them.
But also, we probably shouldn't test it until action is taken on tera. Tera darkrai would obviously be too much, if tera gets heavily restricted or preferably banned I think we can consider dropping darkrai then and it may be manageable down here.
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