Ds lite gets stuck on "loading"

Open the sd card up, click on games and drag & drop the saved games in. Make sure the saved games are not compressed with a zip file.Next time also try copying and saving the whole card system as sometimes the cards can crash.

The ds lite or the pokemon diamon game might of been damaged before u got them

the contacts where the game go got dirty or broken!, u will need to get it repaired

plug in the sd card and there should be 2 files of the game the nds and sav delete the sav file and it should work

NEW GAME

You must update your R4 system files. Download the latest version from R4.

Update your R4 system files

Do so how you normally would when playing the GBA game on a GBA (It best be a GBA game, because DS and DS Lites cannot communicate to older Game Boy games), go through the menus (on the game) and delete the files. It's not a matter of the DS having the problem it's the game.

I've went through the menu's and deleted the game but my game still has "corrupted data":

First, do all you can do, clean out the slot in the DS Lite, and the cartridge (with a damp, NOT SOAKING WET, cotton swab), and try the game again. Start a new save file, save it after a ways, and try to load it again. IF it -STILL- has a corrupted save file problem, then it is time to bring it to the seller or the manufacturer.

The seller: Telling the seller what's happening is great. BUT SHOWING the seller that the save data never loads really helps! Customers can say quite a few things to Sellers just to get a new game or their money back, but showing them is pretty much proof. No, you don't -HAVE- to show them, but if the seller is -that- skeptical, it may be wise to bring your DS along with you.

The manufacturer: All games have a Technical support call number, also going to nintendo's main site,www.nintendo.com/, and going straight to their technical support pages helps too. Sending it in will warrant a little wait time, but if done correctly you will receive a fixed or new game from them as well.

Did you load the other files on the memory card. The games would go in one folder, the system files in another. That is how these cards usually work.