For me its catching all the gmax Pokémon with the correct competitive nature and ability. I also dont like using female Pokémon so they all need to be male on top of that. Took me 2 days of resets doing the raid exploit for a gmax hustle adamant male Flapple and 1 day for a gmax sheer force brave male Copperajah. Managed to catch a gmax modest male Lapras in a dive ball and a shiny gmax modest male low key Toxtricity from online raids.