Because there is no GBA slot, aka. Slot-2.
In a DS you should be able to play GBA games in the slot that is underneath the DS. There is a cartridge slot for DS games and a cartridge slot for GBA games. This is the same with DS lite as well.
You put them in the game slot
No. R4 cards can support Slot-1 games whereas other emulation devices such as the EZflash 2-in-1 which is a Slot-2 device can play GBA games
No, the game boy slot was removed in favor of an SD card slot.
It can, but you only need to put it in the slot. You can't play gba games though.
No. The 3DS does not have a slot for GBA Cartridges and therefore cannot play GBA games.
No, It doesn't have a slot on the bottom
Yes there is a different slot for them.
yes, there is a slot at the bottom for GBA games.
No. The slot that looks like a DS cartrige slot is used for SD Cards only.
No because it does not have a slot for the sp games