Pixelmon Mod

So I downloaded the 1.16.5 and it's not only full of bugs but seems pretty non-optimized. SO THE PROBLEM HERE IS, I can't use combat items (potion for example) whenever I try it in battle the game crashes (can't experiment with it since the game is loading for too long)

The 9.0.9 version of the Beta releases has a couple known bugs currently. I recommend using 9.0.8 for now or waiting for the next release.