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Can Beast take him?
https://tse2.mm.bing.net/th?id=OIP.rHcsXyTad9FwSf_vqNALzAHaNK&pid=15.1&P=0&w=300&h=300
vs.
https://tse4.mm.bing.net/th?id=OIP.gVokzIye85AsKTzz2QqkmQHaF3&pid=15.1&P=0&w=212&h=169

No.

Diamondhead rips him in two.

Beasts conditioning make him an excellent contender for difficult foes.
Even against Apocalypse in Apocalypse first appearance in X-Factor Beast handled himself exceptionally.
Beast would capture Dimaondheads personality haveing studied under Professor X and would drag Diamondheads head along with him to Beasts field of expertise and squarely impose Diamondhead under the pressure of a full assult.