Since Vespa evolved, you should probably name the new species, and then decide whether you want to continue calling her Vespa or the new name. Is the Eldritch Quilava female? And if so is that the mother? it did kind of give birth to Vespa after all.
Also, since The Gengar molecularly disassembled a house earlier, maybe it can do the same with the coral without hurting Elm? Or maybe reassemble him as it goes along?