on your menu screen go to a thing that looks like a wrench and that is your settings go to the network ball thing and it will asks for what language you want touch it and then it will change, if the games are in a different language you cant change it.
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DSTT is a very popular card compatible with SDHC cards. Recently, the DSTT has fallen to the same problem as the R4: clones have found their way into the market. Many manufacturers are making cards that imitate the package and look of the DSTT. Some clones change the name (ie: DSTT-ADV or CN-DSTT) but most label their product as DSTT even if they are not affiliated by real DSTT Team. There is now a lot of information on DSTT official website to identify fakes and clones. and even a guide to telling if a DSTT is real or fake. Contrary to popular belief, running any unoriginal DSTT card does not "brick" a Nintendo DS. It is possible that the card itself will not work, but it does not affect hardware in any way. The most common problem with a legit DSTT card is the infamous "Menu?" screen, much like the dreaded R4 "Loading" screen, which is usually a software issue and can be easily fixed by installing the software from the DSTT website onto your micro SD card.-Wikipedia
A dstt card is like a memory slot for all the nds game roms you have. You load your nds and choose which game you want to play.
You need a different region's game or to change your DS settings.
You can't change the language from within the game.There are different language Pokemon games though, which exist in their own country. You could buy online by importing it if it's that important.
You can not change the language.