Technically it is, but only through illegal methods (in Europe they're illegal, at least, thanks to Nintendo's court battle to make anything that could be used on the DS for piracy rendered illegal to buy or sell - including GBA cartridges that can support homebrew)
Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming
I was a E untill my friend moved out of his house, found a bunch of gameboy carts and gave them to me. Now I'm a A and I love it. Emulators are all well and good, but I always end up hyperspeeding through battles and getting severly overleveled.....I just have no restraint..