Foreword

Pokéwalker, the pedometer device bundled with every copy of HeartGold and SoulSilver.
It uses infrared to communicate with the cartridge of the games. Once the Pokéwalk has been registered to a cartridge (think Bluetooth pairing), one can send a Pokémon to the device, designate the route to follow, and have a chance to capture unique Pokémon and find items, that can then be sent back to the cartridge.

Besides the regular routes that can be unlocked through the regular playthrough of HeartGold and Soulsilver, the Pokéwalker also has special routes locked behind special events, with most of them received via wonder card.

Source: https://bulbapedia.bulbagarden.net/wiki/Pokéwalker#Areas
 

Some of these events were only distributed to only to certain languages of HeartGold & SoulSilver.
(Example Amity Meadow to JPN only, Sightseeing to JPN and KOR only, etc)

As such, it was thought that any special Pokémon obtained from these routes that bears the wrong language will be illegal.

However, it was reported that the above described illegality isn't the case; in fact, the Pokéwalker ignores the language restriction, and also ignores the registered status, and would be able to send gifts to any copy of HeartGold and SoulSilver. This means the Pokémon obtained from routes can be in any language, even if the route was only distributed to particular languages.


And, this tutorial is for just that.