>>24814949The challenge cup seems to come back the same way as the old game, save, then reset and check the challenge cup areas.
Battling the grandmasters requires having a link card battle 10 - 5 times, they have set up a tournament that any club leader/grandmaster/ronald will show up to. You can win multiple random promo cards for beating it.
If you just wanted more legendary pokemon cards you have to use the black box machine in the game corner to make more.
