I created a server for Pixelmon (1.12.2-7.0.3-universal) with "Xaeros_Minimap_1.16Forge_1.12", which currently live in the .mods folder. I wanted my friends to join so I set up my Port Forward through Frontier and the server was working GREAT! I created a "run.bat" from a video I found on YouTuibe with this (for some reason, it still says 256mb on the server console/popup):
java -Xmx2048M -Xms2048M -jar minecraft_server.jar nogui
That was until we crashed after 30-60 minutes and it reset the level of our Pokemon from level 20+ to Level 8. I'm not sure why it's rolling our starter Pokemon back to level 8, but I'm not sure if there was a way that I force-saved the world to the point where it loaded back as level 8.
Note: our items in the inventory and location before the crash were not touched and were fine. Also the Pokemon that we caught prior to the crash disappeared upon joining back.
As you can tell, this did get frustrating after the second "reset" and they have lost the will to play (so any help would be great to get my 20 year old friends to play Minecraft with this 20 year old).