I haven't been able to find an exact guide, but perhaps I can try some. The goal of this trophy involves playing the Dark Cave app on your phone, available after Yuzu and Lime give you the function later on.
The way to get the final evolution, Nekura no Miko, involves first maxing out the prime stats (Health, Charm, and Wit) before the 4th Growth Stage is completed. By that, I mean that when you've hit Growth: 4, you should have all of the stats maxed (noted by a Star next to its name). For the remaining six growth moments, you should focus on bringing the stats down to 1 or 0. I found that if you at least start with Wit by going for a 2-point loss, then supplementing additional ones with answers that give you at least one point losses in two categories at a time, you should just barely be able to get the requirement.
The reason I would suggest starting with Wit is that it doesn't pair well with any of the others in trying to weaken them down rather fast. If you bring Wit down by 2, that's already brought it down to 3, meaning you just need to focus on lowering the others by 4 points a piece within 5 stages while dropping two on it. It is easier said than done, and if a video guide is necessary, give me a bit to try and work it down to a science scheme and I'll make a video.
Two things to note: if you want to get through this fast, just leave and re-enter a room. It'll take about three times before an update is posted. Furthermore, you can either leave the app or press Square to shuffle the questions and answers given to you to give you better choices on how to increase and drop the stats.