When you create a new world (I believe Multiplayer servers also work), click on "More World Options..." and you have the option to change your world type to Biomes O' Plenty. If you don't change the world type to this you'll get the regular vanilla biomes.
Posts by Moonboy65
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Title is self-explanatory, basically Pixelmon Generations was updated to v8.4.1 yesterday, but the modpack shows v8.3.0 instead