no. onli gba in gba and ds from ds!
For GBA no.
A GBA action replay can have GBA cheats, but you can't put GBA cheats on an Action Replay DS even if you intend to use it on a regular DS with a GBA slot.
Yes, you can.
A DS's Slot-2 (GBA slot) is unable to use the DS's wireless capabilities, even if it's a GBA game which could use the GBA wireless adaptors. You can only use the online portions of a GBA game using an actual GBA and a GBA wireless adaptor.
A GBA Charger/Adapter stupid
It depends what you want for your GBA.
Yes, it can considering that the GBA SP is just a newer version of the GBA, just like the NDS and NDS lite.
The GBA can be customized with a huge range of GBA cases, you can even custom make them if you like.
either the micro gba otherwise the ds
yes cos sp's and gba's are the same, but just have different cases
No. The 3DS does not have a slot for GBA Cartridges and therefore cannot play GBA games.