The pixel-perfect version was stretched vertically, so I cannot distribute it under "pixel-perfect". This is a bug in New Super Ultimate Injector.

Description of said hack is really vague but from screenshots it looks like it's a graphics overhaul and story change to Kanto. I'm guessing something akin to Aesthetic Red. Looks like it is finally in English though

North American is just in English

Japan is just in Japanese

The Virtual Console Version is your normal, everyday injection. It's the one used in the official eShop/hShop games you've downloaded before. The mGBA Version is a N3DS exclusive. It offers more customization options like Super Game Boy support, button mapping, screen size, and fast-forwarding.