LoRA meant to replicate the style of Undertale battle sprites.
I would recommend generating 1024x1024 and then downscaling to 128x128 using bicubic filtering, that gave me good results, or just do any big size you want that is divisible by 8 and then downscale it that amount.
This LoRA took a bit to figure out how to make, and I ended up training it with AI generated pics that I modified to be Undertale style rather than actual Undertale sprites, so results may vary in quality but for my purposes it ended up working.