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>no one has posted based rider yet
Dragonite cannot OHKO him with any move with max defenses tailored to the specific attack dnite is going for (if OP can tailor his dnite set on the fly to counter what switches in then I can do it too).
>252+ Atk Choice Band Dragonite Iron Tail vs. 40 HP / 252+ Def Calyrex-Ice: 198-234 (56.4 - 66.6%) -- guaranteed 2HKO
Calyrex can run 216 speed neutral nature for 285 speed, guaranteeing the outspeed on CB dnite.
Calyrex can run a special defense set instead to take on specs
>252+ SpA Choice Specs Dragonite Fire Blast vs. 40 HP / 252+ SpD Calyrex-Ice: 198-234 (56.4 - 66.6%) -- guaranteed 2HKO
meanwhile glacial lance is always a guaranteed OHKO vs any offensive set. You would literally have to run 252 defense impish, and more than 4 HP, meaning you subtract from attack/spatk at that point.
Checkmate, OP.