The generator matrix

 1  0  1  1  1  1  1  1  1  2  1  1  1  1 2a  1  1  1  1 2a+2  1  1  1  1  0  1  1  1  1  2  1  1  1  1 2a  1  1  1  1 2a+2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  2 2a 2a+2  1  1  1
 0  1 2a+3  a a+1  2 2a+1 a+2 a+3  1 2a  3 3a 3a+1  1 2a+2  1 3a+2 3a+3  1  0 2a+3  a a+1  1  2 2a+1 a+2 a+3  1 2a  3 3a 3a+1  1 2a+2  1 3a+2 3a+3  1  0  2 2a+3 2a+1 2a  3  a a+2 3a 2a+2  1 3a+2 a+1 a+3 3a+1 3a+3  1  1  1  1  0  2 2a

generates a code of length 63 over GR(16,4) who´s minimum homogenous weight is 188.

Homogenous weight enumerator: w(x)=1x^0+36x^188+192x^189+15x^192+12x^204

The gray image is a code over GF(4) with n=252, k=4 and d=188.
This code was found by Heurico 1.16 in 0.031 seconds.