I managed to grab the other day it but could not get anything done with it- I poked it around and while it apparently could decompress I only got garbage (I would expect a ncgr to give me some form of image- it decompressed to random little lines everywhere in all the things I tried- not noise that it was before but lines). This being said it did not error out the decompression tool which is what usually happens with a bad file.
Crystaltile2 seems to think it is compressed (I stuck it in rom and had a look then), that it does not compress much and once "decompressed" decompresses back again to a similar size as the original file would support such an assessment as well.
In the hex I did not look hard but nothing that usually gives LZ away (flags and the like) jumped out at me. I did not see any RLE type arrangements and 1bpp did not do much so that pretty much leaves huffman (which I also tried to see) but if it is custom huffman (even if it is just the "probability table" stashed somewhere unusual) that makes life difficult.
All this is very odd.
I think this might be an ASM hack- if there are files like it loaded earlier in the game do a bit of replacement and see if you can not hook things there.
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