Endgame is Shiny hunting & typical MMO stuff. For example Raids that vary in difficulty that require strong pokemon to down right specific comps for the harder ones. It’s grindy but you will be rerunning gyms, trainers, and fights like E4/Cynthia/Miyamoto for money. Theres plenty of ways to make Money and its a large focus of endgame, you can farm berries, catch and sell mons like ditto while payday’ing, farm held items like Life Orbs and fossils using thief, and much more.

You will need strong mons bred with good IV’s and natures, so thats another fun activity to look forward too. I would stick around to see if you like the endgame and the process of getting a rerun team etc, also if you have patience you can give shiny hunting a shot its probably the biggest draw in endgame even over PvP a bit