Errrrrr
Wow, you really have no clue.
No, you can't really code on the DS, and there isn't really any easy way to do it.
I'd start by lrnin2program (Learn HTML, it's a good starter language, but not really a language. Then go for Javascript-NOT JAVA, then a C variant, probably C++).
It's may be hard. Or, if you already know how to code, look for a DS SDK or something.
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