- Rules turn off for legendaries - I can't use them, but I can catch them and reset if I fail/KO them by accident. (Similarly, if a pokemon faints against it, I'm not counting it, since the purpose is to catch it, not kill it)
I actually used Articuno in my Nuzlocke of the original generation (to sweep Lance), I had to keep using Max Repels so Articuno would be the first to appear, then I Master Balled it (it was a Nuzlocke challenge, so I didnt care for getting Mewtwo).
That works for Zapdos too, not for Moltres because Onix will still appear in Victory Road