The language settings of a game cannot be altered. That's why it's best to be patient and wait 'til your country's version comes out :)
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You cannot change the language of Pokémon Black 2.
If it's Japanese it is less likely for it to have an English option.
Pokemon Ruby was released in separate languages. Therefore, you unfortunately can not change the language of the game that you bought.
Unfortunately you cannot change the game's language.
No you can't. Pokemon Yellow is a small game that doesn't have language change.