I will say that a lot of Nucleon's threat would be neutralized if it were thrown into modern OU meta with all the canon Pokemon. I know it's a moot point unless the new devs want to throw that nat dex in, but it's worth noting that you'd have a lot of really bulky and powerful Steel-types (Filter users like Mega Aggron come to mind, considering it gets Stealth Rock and Dragon Tail) as well as a lot of fast priority-users that can basically one-shot it if it isn't holding a Focus Sash (and a fair amount of Pokemon that can outspeed it if it is).
Hell, if we threw it into Sun/Moon meta then Jangmo-o's evo, if it retains Soundproof, would be a common and solid counter because Pixilate Sylveon also likes to run Hyper Voice.
Edit: I realize I wasn't clear why I specifically mentioned Filter users- Filter reduces the risk that M-Aggron or something would get killed by a Fighting type attack or something when the opponent inevitably switched Nucleon out. Near-guaranteeing at least a Stealth Rock and one Dragon Tail.)
Hell, if we threw it into Sun/Moon meta then Jangmo-o's evo, if it retains Soundproof, would be a common and solid counter because Pixilate Sylveon also likes to run Hyper Voice.
Edit: I realize I wasn't clear why I specifically mentioned Filter users- Filter reduces the risk that M-Aggron or something would get killed by a Fighting type attack or something when the opponent inevitably switched Nucleon out. Near-guaranteeing at least a Stealth Rock and one Dragon Tail.)
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