Well before you say "no it wont happen" please listen to my story
Initially in the gen 6 games suicune was issued with "Inner Focus" Hidden ability, through multiple sources, serebii/smogon, so i didnt want inner focus so i didnt buy a black MS before catching my suicune, then out of no where in gen 7 with the release of crystal in VC they changed it to water absorb wtf? obviously i would want water absorb over pressure and seeing how you only get 1 legend per game, i would like to suggest a reroll in ability just for legends, otherwise its completely unfair that i have to switch out against another suicune with my own already in play. Its a big advantage when you have already a calm mind set up and I defeinitely will not restart PRO and do 750 hrs + and fulfill my dex again just for roll for a hidden ability.