SDXL LoRAs get the best effect when running on the models which they are trained.

This adapter LoRA let you run PonyV6 based LoRAs on Js2rpony with acceptable effect.

I use https://civarchive.com/models/271989/muk-monsieur-style-for-pony-xl as an example:

PonyV6 VS Js2prony without using adapter.

Js2prony: using adapter VS not using