Hey, I was wondering if I could play on a game boy advance as well as how I should record it. Thanks!

Yes you can play on a GBA. The only consoles banned are the Gameboy, the Super Gameboy, and the 3DS - all due to inaccuracies - though the Gameboy is only banned for the DX version, not the original. You can record with a webcam or even a capture device, however the latter is far from cheap to the point where getting a Gameboy Player is likely the better option. With a webcam, make sure the game screen is clearly in focus and easy to see. The best way of going about this is mounting the camera face-down on a tripod, then positioning the console below the camera. Here's a good reference to go by for what is acceptable: Notice how the screen never gets out of focus and doesn't get clipped by the edges of the field of view.

GameBoy/SGB2 are actually allowed for LADX. You can't complete 100% (due to Colour Dungeon not being doable on GB) but it's technically allowed. You'd just never have a reason to want to do so.

Only SGB1 and 3DS VC are banned for inaccuracy (as far as official platforms go).

Okay. Thank you very much! You guys are so helpful. I think I'll try this!