Minecraft crashes anytime I try and run Pixelmon 5.0.4 on 1.10.2?

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderExce… Caught exception from Pixelmon (pixelmon)

Can you post your crash log to pastebin and give me the link? You may see Error: net.minecraftforge.fml.common.LoaderExce… Caught exception from Pixelmon (pixelmon) but that doesn't actually give the reason for the crash other than it's related to the pixelmon mod

I could help if you showed the whole crash report, the only one line doesn't help really much.