You can trade with strangers online via the Medal Swap. However, be aware that Nintendo Wi-Fi services for the 3DS are technically deprecated (the eShop closed in March 2023). While trading via direct connection might still work for some, it is highly unstable. You are better off using private servers like "Pretendo Network" if you have a homebrewed 3DS.
The creators of these generators do not possess any secret Level-5 software. They possess a simple webpage, a fake loading bar, and a desire to harvest your data or infect your devices. Yo-kai Watch 2 Sailornyan Code Generator
Before we dive into the mechanics of generators, it is crucial to understand what you are trying to obtain. Sailornyan is a Rank A, Rare Yo-kai of the Charming tribe. She is a special variant of the classic Koppanyan, designed with a sailor’s outfit (a "sailor fuku") and a space-helmet-like headpiece. Her design is a direct crossover reference to Professor Layton vs. Phoenix Wright: Ace Attorney – specifically, the character "Mysteria" and her sailor-themed outfit. You can trade with strangers online via the Medal Swap
There is or QR code to unlock Sailornyan in the standard version of Yo-kai Watch 2 You are better off using private servers like
Below is the definitive guide on how to befriend Sailornyan legally, how the digital codes work, and what alternatives exist now that the Nintendo eShop has closed. How to Get Sailornyan in Yo-kai Watch 2