Step 1. Stop being a dummy you dummy. You're being a dummy and its making you dumb.
Step 2. Copy all files from your SD Card to a folder on your Desktop.
Step 3. Format Card.
Step 4. Put latest firmware on SD card and run it on cart (Skip if you're using latest)+(Might have to Downgrade/reupgrade)
Step 5. Copy all data back over to SD card and delete all your corrupted saves. (Pokemon sometimes saves corruption)
Step 6. Reload WarioWare and wait a minute or two for it to load. It usually takes awhile to start up the 1st time because the save file IS FUCKING 32 MEGABYTES. So take the amount of time it normally takes your card to create a standard 512kb save file and multiply that time 64 times and you'll get the amount of time you must wait for the WarioWare save to finish.
Step 7. Thank Njrg.

Don't delete your backed up data after copying back to the card, in an event you fuck something up, you're going to be glad all your files are still on your PC's Desktop. It also never hurts to delete your flashcart's personal settings files themselves (They'll be freshly recreated when you re-boot it)

Also I'm not Mod, but I think you should have posted this in here.

 

Well formatting is usually the last resort problem solver for all flashcarts.

Here's my last suggestion as unnecessary as some of the steps may sound.

You should know a few things. By clean rom I mean a rom thats unaltered. No patched roms, no trimmed roms.
And this is going to sound stupid, but we're going to assume that all your current roms are corrupted.
If by any means you cannot get through a step because of a corruption issue, then we're going to assume your flashcart is ruined, and will ruin any game you attempt to play. Some flashcarts have Reset features that force them to go back to factory firmware and conditions, however that info will be on your flashcart's site, so go bug them about it. So this may not be your last chance, but this will be my final advice. Its up to you to skip step 3 because its waaaay unnecessary. Its just one of those desperate "you never know" moments I have. There have been many times I gave what would be hopeless advice that actually turned out to work when it came to software.

Step 1. Backup Save files. (Should already have done so)
Step 2. Format Card.
Step 3. Downgrade Firmware to the 2nd most recent Stable firmware (Not Beta if your flashcart has any).
Step 4. Upgrade to the most recent stable firmware.
Step 5. Format Card again (Why the hell not)
Step 6. Copy a clean rom to your card for testing. Try to pick a game that hasn't been too recent like Rom# 4500 or lower.
Step 8. Load a clean rom of WarioWare. If you think the Wario you got from your source was a bad dump, then find a new source or try the Japanese version.
Step. 9. Turn off all/any of your Cart's Features. Disable Cheat devices, Real Time Saves, ect... (I have a Cyclo, sometimes when a game doesn't work for me, I'll turn off a feature and the game will work.)
Step. 10. Get that WarioWare save. WarioWare was the cause of all your problems so you need to get this rom working by all costs. Getting this game stable and working is #1 priority.
Step. 11. Skip Step 10 if you think WarioWare just isn't worth it (Because it really isn't).
Step. 12. Put back all the saves back on SD Card.
Step. 13. Replace all current Roms with clean Roms.
Step. 14. There is no Step 7.
Step. 15 If all else fails, buy a Cyclo like you should have done in the 1st place, you Jew. (Assuming you're still using DSLite or older)

 

You need a name change Whatta ya think about "The_Dim_Knight" ?
It might be a bit more appropriate for you and save some confusion on this forum.

 

Well method 2 was pretty much "Clean Slate" method so if that failed, then the only thing I have to say is you got what you paid for.

 

haha wtf...

 

Drop kick that card in the bin.

 

Well, my current status is that old game saves seem to be back online.

Saves for newer games write just fine but sometimes they don't load up and I have to reset in order to get them to load.

And WarioWare still won't even load up (I've let it sit more than 20 minutes).

Using: DS Lite, AKAIO 1.6RC2 and yes, I set WarioWare's save file to be 256MB.