I still play Monster Hunter online on the Japanese servers, all you gotta have is swap magic and a japanese copy of this game, and you have to patch the dnas id for the game then burn it to a disc, and then you should be able to get online, my online name is Epic Guy If you have any questions, please message me...If you want to download Monster Hunter 2 dos for ps2 just go here:http://thepiratebay.org/torrent/5559247/Monster_Hunter_2_%28Dos%29_-%5BJAP%5D_-_PS2DVD
Also there is an english patch for this game that you can download and patch to the game and burn it, the link for it is here:http://thepiratebay.org/torrent/5559235/Monster_Hunter_2_%5BJAP%5D_-_English_Translation_Patch__PPF-O-MATIC
What you gotta do to patch the game is you got to extract the patch and the game that you downloaded to your desktop, (thats the simpliest way), then you have to open up PPF-OMATIC (its a program that came with the download for the patch), and you select the ISO image for the game that you downloaded, and select the english patch that came in the download then click patch, then just use DVD Decrypter or another DVD burning program, and burn it to a disc (Only use a DVD-R).
Here is the link to download the DNAS patcher, its a program called WinDip:http://forums.afterdawn.com/thread_view.cfm/7/80568
Just scroll down the bottom of that page, and it should give you information on how to use it. Also, the Monster Hunter 2 DNAS ID code is the same as the Monster Hunter 1 ID CODE, and if you enter the Monster Hunter 1 ID for the monster hunter 2 ISO file, you will be able to get past the DNAS screen.
Also, if you want to play the online quests, and you want to hunt by yourself offline, you can use codebreaker to play the online quests: