You will use , a file manager installed on almost all CFW 3DS systems.
: You must install this update to access online functionality, such as Link Trades or the Global Trade System (GTS). Battle Videos
While the 3DS official servers are still technically active (unlike the Wii U and DS), connectivity can be finicky on older firmware versions. Update 1.2 optimized the handshake protocols for online battles and trades (Festival Plaza). Even if you are playing on a private server via Wi-Fi patches, having the latest game logic ensures a smoother experience.
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