NPCs can not be seen on Journeymap.
I ticked the options for NPCs and Monsters etc.
Pixelmon will show fine, but NPCs won't.

The Wiki of Journeymap says for Modintegration:

Be sure your EntityCreatures implement at least one of these Minecraft core interfaces: IAnimal, IMob, INpc, or IWaterMob.

How can I check if the correct core interface is implemented by the NPC EntityCreatures?

I am new to Minecraft. Sorry if this is not a Bug.

I talked to JM Mods and they won't bring JM 1.12.2 updates anymore.
The only solution will be that Pixelmon Developers must follow the ModIntegration-Rules.

As it works for Pixelmonsters already (i think with a custom solution by JM dev) and there won't be any updates or a custom solution by JM devs for 1.12.2), you Pixelmon-Developers must follow the Integration-Rules.

Thanks in advance

Not sure if this is something doable(idk anything about coding), but I'll mark this as awaiting team input and see if the team has any input. But the npcs are indeed not showing on map.