Welp, as it turns out, it really is the Pocket Monster pirate on a GBA cart, running through PocketNES, I assume. It runs slower and choppier than on a normal NES, but works, so that's a thing. Plus it's got the debug/glitch/whatever from the original where you can just hold Start and skip through the entire level. I liked doing that since the platforming got a bit devious after the first two levels.
LATER, NERDSSpoiler: click to toggle
Joining the Pocket Monster cart is
Pokemon: Frigo Returns, from a seller in Australia! Who is Frigo? Where is he returning from? The world may never know. But what I
do know is that this cartridge feels like it's made from extremely cheap plastic. It's shoddy as heck and I love it.
The game itself is more or less just Ruby, with everything in Hoenn changed to have a pleasant snow-white palette which is also reflected in the battle scenes. Unfortunately, it kinda falls flat since there's some very poor tiling once you get further out, and it clashes hilariously with the many sandy beaches that Hoenn is known for.
And the entirety of Rustboro City, for that matter. As for the eponymous Frigo, it is literally just Articuno with a terrible sprite. You get it in the second town right after you start the game and go from there.
Also included in this haul is Keitai Denjuu Telefang: Power Version and while that's not a pirated game I don't care, because I'm so glad to have found it in the first place. I seriously love that game and more people need to know about it.
without finding the Diamond bootleg first, of course.