First off you'll need
SpoilerAL. It's a Japanese cheating tool similar to cheat engine. You'll need to download the "th_ssg20080502.zip" file from
here. Extract SpoilerAL wherever you like, and extract the "th" folder from the other zip into SpoilerAL's SSG folder.
Now for what it does - I got this for messing around with Cherry stuff in PCB Practice, so I will explain that here since I've already figured it out. Stuff beyond that I'm not really sure what it does, so if someone wants to do some translating to add to this, feel free. There's stuff for EoSD through MoF in here.
First off, load up the game, and then SpoilerAL afterwards. You may need to use applocale for spoilerAL if your computer is not in JP locale and you want everything to display properly. Your SpoilerAL window should look something like this.

Select the game you want to play - PCB in this case. You'll now see this lovely thing, full of cheats and whatnot.

I'm not really sure what any of these do. I assume there's stuff like infinite boss timers and whatnot in here, but I'll leave that for someone else to figure out. What we care about now is cherry. Cherry+ and the value of cherry items. Click on that thing that says practice and it'll make a dropdown list with a few options. The first one is Cherry+ and it gives you some nifty calculator thing to input the values you want.

Keep in mind that you're entering values in base 16 by default. Be sure to click the button on the bottom left (just under Max) to change it to base 10 unless you're a weirdo who just likes converting numbers from base 16. Type in a number from 1 to 49999 and hit enter (or click the button on the top right) to set the cherry you'll start stages with. I'll use 47000 in this example. It should end up like this!

Now okay, fine, we have 47000 cherry. But what about cherry items? We're still only getting 1000 Cherry+ from them. This is what the option just below the Cherry+ editor is for - set a value from 0 to 21 for each spell card captured to that point. For this I'll say we're practicing Lunatic stage 4 and want everything capped everything to this point - 12 cards. Change the value to 12, and your cherry items are now worth 2200 each.

And now you can
pretend you're HS and make a border, which you cancel into another border, which you subsequently cancel into another border, after which you cancel it into another border, which you of course pop to make a border with and pop it again to NOT QUITE make another boder... until you collect those cherry items a few seconds later, after which you'll have a nice fancy border.
I'm pretty sure the third option is rank, but it's not something that really matters in this game, so you can just ignore it.
Also I would like to give a special thanks to Yakamino for linking this stuff to me last night. I wouldn't have this stuff or be posting it here if it weren't for him! ( ◜◡◝)