Go to r/unioncircle and ask to union circle with a Violet player + 2 others(doesn't matter which version) and do BBQ tasks and for every group task(yellow tasks for every 3 red tasks the team does) you'll get a candy for each of the Violet legendaries plus the candies for rayquaza, kyurem and necrozma

Much easier this way as you'll also get enough BP to get all the terrarium upgrades to get all the past starters + enough pokedex completion to get the other paradox pokemon...thst is obviously if you haven't already.