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Yes there is an online Multiplayer that will let up to 8 players play online
Yes the PS3 does have online multiplayer play, the Nintendo DS does not have the online play see related link
Nintendo 3DS games are only playable on Nintendo 3DS systems, and in order to play Nintendo 3DS games multiplayer, you require multiple Nintendo 3DS systems. However, Nintendo DS and DSiWare games that support multiplayer can be played using the Nintendo 3DS system.
No.
Your Nintendo DS username will represent you when playing multiplayer with other people. It is also the default name used when playing online.
It depends on what type of multiplayer, there is multiplayer that connects to other DSs nearby, and there is the Nintendo Wi-Fi Connection which connects over the Internet. Nintendo Wi-Fi Connection needs access to the internet, local multiplayer doesn't.
you cant
Yes, you can.
It is multiplayer online but not split screen.
just nintendo switch to can hook it up to the tv and play with friends
No, but New Leaf is. New Horizons is sold on the Nintendo Switch (:
Yes, the Nintendo Switch will not be region locked