GUYS!! HUGE DISCOVERY!!
So I spent a bit of time trying to figure out how to lower my cupcake level on purpose until I realized that it had to do with some par formula involving you and your opponent matching a number of orbs by the end of the battle. This might not be entirely accurate since it's such a strange mechanic, but if you beat your opponent with as little orbs as possible and/or your opponent matches a lot of them, your cupcake level will go down. It's very easy to perform the former with an Attack-100% MagiPet. The par may be sensitive to your XP level and cupcake level with your opponents'.
So I had my pony, at XP level 20 and cupcake level 120, battle XP level 1 ponies with the lowest cupcake levels, who are my befriended alts. I fought them with an Attack-100% MagiPet while they had none. My high health and their useless candy orbs would make the battle last so long that I'd be going far under the par. As I mentioned, my cupcake level was at 120, and with it dropping 1 level at a time, I had to do this A LOT to reach the lowest levels, except the first few times before my falling level came more into play, forcing me to do them as long as possible. With enough patience, I was actually able to reach all the way to the bottom (level 0) and see the rankings you can't normally see. The low rankings have been revealed!!
Oh, and your cupcake level will allow you to battle other ponies around that same level. Since no other ponies had levels that low...
But that's not all! I continued underparing to see if my cupcake level would go below 0, and it actually puts it in the negative!
With the ranking changing every 14 cupcake levels, I kept going until I reached when the next (well, previous) ranking would change (at -8). And then this happened:
I literally broke the game. Several texts have vanished and none of the buttons can be clicked or will appear different when you place your cursor over them, except "Get More Sparkle Gems!" and its pop-up's buttons. So you're basically stuck on that broken screen, but that can be fixed easily. If you have a negative cupcake level and refresh the game, it will reset that level back to 0. If it wasn't for that, my pony profile would've been bricked! Of all the bugs I've seen in this game, this is at a new level, so to speak.
Also, did you know that you can select and copy your XP level number on most of the game's screens? On that broken hub screen, although it shows nothing, you can still select where the number of your level was and even copy it. What does it say when you paste it? "999". Wow. If only I could see what the battle screen looks like. I can guess that you need your "Level Up!" button to detour you to a boss for that, but I doubt that'll work either. I really don't want to go through all that again just to find out. The way I had to lower my cupcake level was to finish off my opponent before they finished me, and keeping my eye on the game most of the time was not fun. I probably will since I'm collecting everything I can in the game for my wiki, but I'll do that later before the game shuts down. This whole experience was most of my weekend.
Well, that's all the cupcake level ranks, as well as "Corruptcake"! Here's an accurate cheat sheet featuring all of them!
-8 – (Hub menu breaks)
-7–6 – Vanilla
7–20 – Cherry
21–34 – Lemon
35–48 – Banana Split
49–62 – Coconut
63–76 – Peanut Butter
77–90 – Strawberry
91–104 – Marshmallow
105–118 – Red Velvet
119–120 – Chocolate
??? – Vanilla Cupcake (Shown on loading Pony Page)
See you later, and good NEIGH!!