So if someone has different mods installed they can still access the villagers those mods spawn instead of pixelmon just turning those villagers into more trainers and pixelmon villagers.
I say this because I have a mod installed that constantly respawns a villager infinitely in the nether and if pixelmon keeps turning it into a pixelmon villager it lags the game because it just respawns said villager over and over and that means infinite pixelmon villagers.
P.S. it spawned more than 2.5k villagers at one point I had to /butcher all mobs to get my game to come back so i could leave the nether.