This datapack reduces the amount of additional levels that bosses have over the player's party depending on their tier. The number of added levels is nearly slashed in half by this datapack, reducing the difficulty of bosses that rely on boss tiers.
This pack is made for Minecraft 1.16.5 and is intended to be used with the Pixelmon mod.
If you have any issues or recommendations, please leave them in the comments. However, I will not be responding to basic questions regarding how to use a datapack. There are plenty of resources for that available elsewhere.