the G6 lite has built in memory so you dont have to buy a memory card. the passcard is for loading the G6 in DS mode.
The M3 Lite needs a Micro SD card to hold your media. you transfer the files from your computer to the Micro SD card using an adapter to connect to the card. passcard is for loading in DS mode.
The DS-X has built in memory also. it is more expensive than the other two, but it doesnt need a passme type device. and it loads from the DS slot, which means no GBA support.
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