Many users ask if a Wii console or game from a different country can be played together. Sorry, both the Wii console and the games are regional. What does that mean? Well, Wii games from a different country will not work on your Wii console from other region of the world. For example, North America uses the NTSC-E format, Japan uses NTSC-J format and PAL format is used for the rest of the world. So a game brought in Hong Kong will only work in other Asian countries, and so on. The safest bet is to make sure you get the Wii console and the games from the same country if you want to play them.
It's important to also note that other countries use different electricity power and if you brought a Wii in a different country you might need a power converter.
Wii's region lock does not stop one's ability to exchange messages or Miis with friends across the globe. It may affect Wi-Fi game playing by forcing some regions out of online play. But mostly it assist regions in being able to play Wi-Fi games within the regions against other players, which make a difference in the speeds and results of the games.