They're used for a lot more than that. IPS patches are basically used for a multitude of things, bugfixes, adding something to a game(Like a new character or something), and those cases where someone translates a game and then converts the data to an IPS patch for everyone's use.
is there a ips patch for Digimon world sunburst for the ds or Digimon world Moonligt Those are ds games in japenese is there any for those for translating And where can i download ips patches
I'm afraid not, you're not going to see much in the way of NDS hacking until the emulators are improved on. As for a place to download IPS patches, try here