Is there any ARDS codes for MMSF2?

Nope (probably yet).

I think, these are Action Replay codes.

http://www.supercheats.com/nintendods/mega...orce2codes2.htm

Yeah, it's only a few. I'm still not quite sure if there's more out there (yet).

I tried to get codes for latest games but certain thing is not working so I can't do that for now ;)
Remember that hacking DS game is harder than GBA :p