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##Actually, 18 bytes

5Pτ;r;∙`MúE`M╪k♂Σi

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-4 bytes from Leaky Nun, and the inspiration for 4 more

Explanation:

5Pτ;r;∙`MúE`M╪k♂Σi
5Pτ;                two copies of 26
    r;              consume a copy for range(26), duplicate that
      ∙             Cartesian product
       `MúE`M       for each (x,y) pair:
        M             maximum
         úE           element in lowercase English alphabet
             ╪k     list of length-26 sublists
               ♂Σ   concatenate strings in each sublist
                 i  flatten and implictly print the stack