OptimusDark : sorry for offtopic!
Gateway use an exploit/kernel vulnerability.
I don't know enough about Sky3DS.
Back in the GBA days, flash systems used the LINK port on the console to transfer files to the Cart/RAM so they were called linkers. In some peoples minds, the term stuck and is given to any flash system
You beat me to it, but I guess you used better words than I would have used.
we, old modders, knew a lot of different devices.
Now people only know DS flashcarts and the easy method to transfer (lot of) games on a single MicroSD Card, and are not happy with the price.
GBA was a lot more expansive (150-200$) and could hold only ONE game (later, it could hold ~10 if you put little games on it). The transfer speed was verrrry slow and connected to LPT (parallel/printer port) where you plugged your GBA cartridge directly in the "Flash linker" (which made the link between the PC and the GBA cartridge).
You had to patch all games to make them work too.
Now everything is easy.
Edit:
Oh, and before GBA era, it was called a "Copier".
SNES had copiers to copy a game to floppy disks.
Copier, linker, flashcarts, etc.
Edit2:
Flashcart because a "cartridge" which could be flashed. Flash Cart(rige).
(even if the picture show "card" on it

)
But there's no rule, and everyone is calling it like he want.