Phantom hourglass, sonic rush and other games are always spanish or something

??? When I download the games noted in title, its always in some other language!! Even in (U) type download

you have spanish firmware on your flashcart then.

If emulator like no$gba, this is what you do. Change the Emulation Option load GBA BIOS, and then reset. It may crash with a few NDS games, doing it with GBA games works fine. Then change the proper NDS firmware language in the settings (works like real DS firmware) to English, it's not by default on English. Then save the settings and restart. Should work.