Two ways: 1) Buy or build a ROM interface device, and download the file directly from the cartridge, or 2) perform a search on Google.com for the name of the GBA game you wish to download and keywords that imply a download, such as "Super Mario Brothers GBA download" or "Super Mario Brothers GBA ROM". Many sites host these ROM files, plus many Torrent sites will have downloads for these files. Be sure you actually own a copy of the game, or you risk legal issues (you do anyways, since piracy is actively pursued, but at least you have a defense if you own the game, which can be a mitigating factor).
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download a Pokemon gba ROM and no$gba
On the internet.
Not yet but I think that to expand there audiences, they will make gba games eventually downloadable.
To play Pokemon games on computer you have to download a emulator I would recommend these: Desmume No$gba (not for gba games) and for playing gba games: Visual Boy Advance
See the related links for a website, but you have to download a plugin.