Here is my suggestion is the problom with pixelmon is not released fowarding to patricks problom,
If pixelmon is still not working right, i would suggest re-developing pixelmon 9.0.0 to aternos
Remember this is just a suggestions, we need to fix this problom therefore if patricks pixelmon server still does not work, we found 1 solution but i do not think it worth it, this was posted by my friend Garnetzx