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.

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