why use devil fruit?

1ST OFF WHAT IS A DEVIL FRUIT?

- its a fruit that make ur digimon get to the lowest possible size.
 example:
          3/5 digi uses devil fruit from 90% it becomes 72%[the lowest possible size]

Question:  why the fuck use and buy that shit?

 Answer: because after using a devil fruit and getting it to the lowest size possible and using a goddess fruit on it will get it  a chance to have the highest possible size

example:
       5/5 digi uses devil fruit from 125% it becomes 118%[the lowest possible size] and u used a goddess fruit on it and it will have a chance on 130%[the Highest possible size]