Kizuna

One adapter. Every way to play.

Plug Kizuna into your Game Boy, Game Boy Color or Game Boy Advance and open the app on your phone. Trade across generations — including a real, wireless trade to your Switch — back up every save, and play online. No computer needed.

Pre-order See how it works

No homebrew · no hacks · legitimate trades on standard, unmodified hardware.

Now
GBA ⇄ Switch

Trade Pokémon between your Game Boy Advance games and the Switch versions.

New
GBA Online

Your Game Boy Advance can trade Pokémon online with other GBAs — or with the Switch versions — anywhere in the world.

New
Switch Online

Your Switch can trade Pokémon online with other Switches — or with Game Boy Advance games — anywhere in the world.

New
Save Vault

Back up your cartridge saves — safe on your phone and in the cloud — then load them back onto any Game Boy, Game Boy Color or Game Boy Advance cartridge.

New
DS Online

Bring Nintendo DS-era games back online for trading and battling.

New
Game Boy Online

Trade and battle Red, Green, Blue, Yellow, Gold, Silver and Crystal on Game Boy or Game Boy Color, online.

New
Mystery Gift

Official event Pokémon and items from Nintendo, delivered straight onto your game.

Coming soon
Nintendo 3DS

Trade Pokémon directly with Nintendo 3DS games — no Pokémon Bank, no mods. In development.

Companion app

Set it up from your phone.

A free app for iPhone and Android handles the fiddly bits — pairing, Wi-Fi, updates and online trades — so you never touch a computer.

Guided setup

Pairs with your Kizuna over Bluetooth and walks you through Wi-Fi and your trainer card in a couple of taps. No manuals, no fiddling.

Automatic updates

New games and features arrive through the app — one tap, no cables, no computer, ever.

Trade online

Match with a friend by a short code or QR and trade over the internet — no being in the same room.

[ setup wizard ]
[ updates ]
[ trainer card ]
[ online trade ]

Screenshots from the companion app.

Get Kizuna

Every generation, one adapter.

£45 / $60

Excludes shipping · VAT, import taxes & duties may apply and vary by country.

Pre-orders ship: Japan, mid-November 2026 · United States and Canada, end of November 2026 · European Union, end of November 2026.

✓ Ships from Japan ✓ Small-batch, hand-built ✓ Works with your existing cartridge
Pre-order now →

Hand-built and shipped worldwide from Japan. Shipping is calculated at checkout; local import taxes and duties vary by country.

Good to know

Questions

Does it change my save file? +
No hacking, no editing. It performs a real, in-game trade the same way two Game Boys would — your Pokémon simply leaves one game and arrives in the other, exactly as the games intend.
Do I need any special software? +
No. You use the trade menu that's already in your game. Kizuna plugs into the GBA link port and handles the rest.
Which games work? +
Pokémon FireRed, LeafGreen, Emerald, Ruby and Sapphire on Game Boy Advance, trading to and from the Switch versions of FireRed and LeafGreen. More titles may follow.
Is Kizuna the same as GB-Link? +
No. Kizuna is a separate product, not made by or affiliated with GB-Link. Kizuna is designed with non-technical people in mind: you set up and play from the Kizuna app on iPhone or Android, and there is a website as well. Kizuna doesn't provide a way to run custom code in your games, such as custom Mystery Gift files, or to alter or create Pokémon.
Can I trade both directions? +
Yes — move Pokémon from your GBA cartridge to the Switch, or back the other way.
I already have a GB-Link. Can I trade with Kizuna players? +
Yes. Open Kizuna Link in Chrome or Edge on a computer, plug in your GB-Link and share a room code with your friend – they can be on a GB-Link or a Kizuna adapter. It's in preview with Gen 3 trades first. GB-Link is a separate project and isn't affiliated with Kizuna.
How is it powered? +
Over a standard USB-C cable — nothing to charge, no batteries.
The name

Kizuna means “bond.”

Kizuna (絆) is the Japanese word for the bond between people — the ties that hold across years and distance. We named it on purpose: this device carries more than save data. It brings the Pokémon you bonded with twenty years ago into the games you play today.

Made by a small retro-game shop in Japan — hand-built in small batches, shipped worldwide.