not sure how you can get adaptability on a crest, but you can get the same effect with this
ctrl+f and search adaptability then go to the second instance of it
you should see a line of code for steelworker, copy it and erase everything to the right of the words:STEELWORKER
it should look like this:
elsif attacker.ability == :SHARPNESS
damage*=2.0
swap sharpness for the ability of the pokemon you want the crest on