I am having a hard time finding any on ebay that say .com.cn. They all just say .com.

I did find this one on Amazon that says .com.cn and the price is comparable to ebay:

https://www.amazon.com/RGEEK-Update-Version-R4ISDHC-Golden/dp/B092HQ48V9/ref=psdc_11846801_t1_B08YJ8R4FS

There is also this one that comes with the SD card (that i would replace) but it is $30.

https://www.amazon.com/Update-Version-R4ISDHC-Memory-Nintendo/dp/B08YJ8R4FS

1. If you want to do the legitimate way, its possible but requires two ds, pokemon black 2, 3ds pokemon game (xy, oras, sunmoon), R4 and an active subscription of Pokemon bank and Home.

Luckily, an R4 is super cheap and can find one for 25 bucks on amazon:https://www.amazon.com/Update-Version-R4ISDHC-Memory-Nintendo/dp/B08YJ8R4FS/ref=sr_1_4?crid=3F46BB02ZU1E5&keywords=r4&qid=1653937914&sprefix=r4%2Caps%2C348&sr=8-4

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Once you get the r4, transfer the save file to it and run it on your ds. This will treat your gf's game as a real game and so you will be able to trade to legitimate copies.

Since it's treated as a real game, just proceed with the transfers.

You first need to trade heartgold pokemon to black/white 2 game. Then transfer black/white 2 pokemon to any of the 3ds games. From there, you can transfer them to Pokemon bank with a paid sub and then proceed to move them to Pokemon home.

Once at pokemon home, you can then transfer them to any of the switch games with an active sub :)

*keep in mind, you need to have all the games beaten in order to transfer them over and of course make sure the pokemon are legit.

*yes, you can use 2 R4s to trade between two games :)

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1. Now... if you have a modded 3ds then you can skip all the transferring as you can simply copy HGSS pokemon to 3ds games using pkhex and then use pokemon bank to transfer them over.

You need a modded 3ds to extract 3ds save files using checkpoint (since 3ds game saves are encrypted).

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I know this because I'm currently doing this lol

https://www.amazon.com/dp/B08YJ8R4FS?psc=1&ref=ppx_yo2_dt_b_product_details

Buy this. Just got it yesterday. Has every DS and GBA/GB game.