Nintendo's home consoles have always been region-locked, via intentional hardware differences on the NES/Famicom, SNES, and n64, and via software means on everything newer. The Game Boy line and original DS (including DS Lite) are not region-locked at all. The DSi is regioned for DSi-enabled software, including DS/DSi hybrid software like Pokémon Black and White. The 3DS is region-locked in software.