I've been having these graphical bugs since the start of the game, especially from weather effects, but they haven't been too bad. Apophyll Beach, however, has been a mess for me with constant graphics issues inside and outside as described above where essentially you have to feel around to get where you need to go. Even this has still been playable at the end of the day. After I beat the gym leader and am tasked to go to Azurine Island, I cannot reach the boat as my game crashes every time I try to make my way over to it.
Don't get me wrong, I'm pretty sure this is my own compute