No, the 2DS is not compatible with Game Boy Advance games. The latest console that you can play Game Boy Advance games on is the DS Lite.
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Pokemon Emerald was only released as a GBA cartridge, the DSi XL has no GBA slot so you can't play it.
Yes you can you put on the bottom slot
Yes, the Nintendo 2DS is compatible with 3DS games. However, autostereoscopic 3D will not function.