You don't 'delete' games like on a computer, just take out the cartridge and put a new one in If you mean game save files, they're stored on the cartridge and it varies between games
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I dont think you can.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.
There is no such thing as a 'DS lite' game. If it's a Nintendo DS game, it works on any model.
You can't download games onto a DS Lite.