Install OS X on the virtual hard disk. When the first menu appears, open Disk Utility and "Erase" your virtual hard disk. VirtualBox 4 supports DMG files natively, and InstallESD.dmg is bootable. 
dmg to the file-picker dialog in VirtualBox). To SATA port 1 (the first free one), attach "InstallESD.dmg" from inside the Mountain Lion Installer package (right-click in the finder to show the package contents, and drag the.(I also suggest giving it more than 2 GB of RAM, and more than 1 CPU.) Turn the video memory up to 128 MB - at the default of 10 MB, it'll boot but you won't be able to see anything.
You can use either "Mac OS X (64 bit)" or the 10.8-specific one - they both seem to work.
Install VirtualBox 4.3.12, or whatever the latest version is. On OS X 10.9, you'll get a warning that you can't downgrade, which is fine. In the App Store app, click "Redeem" (top right on the main page), and paste in the code. 
Even though they're just emailing you a PDF with a license code, it's done manually (so I'm told), so it really does take 1-3 business days to get to you. Go to Apple's web store ( not the App Store app), and search for "Mountain Lion", and pay $20 for it.
First, you need to buy Mountain Lion (if you haven't bought it already). In fact, an interesting feature in VirtualBox can save sessions on the operating system running on the virtual unit, so you can close it and come back exactly where you left it. The advantages of creating virtual units are many, like using programs that are only compatible with one operating system or the other, taking the virtual modular units with you, and creating safety copies of them. The program supports almost all versions of the most recent operating systems, such as Windows 10, Mac OS X Yosemite, and the latest updates of Ubuntu or any other Linux distribution. You have to take into account that these take part of the actual physical resources of your computer, so you need an equipment that is powerful enough to run both the guest and host operating systems. The virtual disc where the system runs is completely customizable, and it lets you modify the virtual hardware to whatever specs you need, be it the processor, the RAM memory, or the storage capacity. VirtualBox is an open-source and multi-platform tool, available for Windows, Linux, and Mac OS X, as well as other operating systems, that lets you create virtual disc units where you can install a guest operating system, inside the one on your own computer, and use it as if it were actually installed.
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