Nintendo’s official Wi-Fi Connection servers for the DS were shut down years ago, but you can still access "downloadable" players and special items like the via fan-run servers. The DNS Exploit :
: DeSmuME is the most widely recommended and stable option. Download Inazuma Eleven 2 - Firestorm (Europe)
Are you planning to play this on or through an emulator ? Nintendo’s official Wi-Fi Connection servers for the DS
To stay within legal guidelines, you should "dump" the ROM from a physical cartridge you already own. Download Inazuma Eleven 2 - Firestorm (Europe)