You can't. You'll have to get an English Pokemon Red cartridge.
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if you installed English as the default language, and others language as secondaries (ex: Spanish or russian) during the installation? you can change the language, but if you didn't installed secondaries language you will to able to change. for ex, i have english as default language, if i want to change to spanish, just go to: C\program files\Solidworks\lang there rename the folder "English" with Spanish, and the folder "Spanish" rename with "English"
Unfortunately you cannot change the game's language.
You can't.
If it's Japanese it is less likely for it to have an English option.
You can't. The game is programmed to the region/language. Unless you hack it and patch it into English.