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Sadly no, Nintendo tried its best to stop all the use of AR on Pokemon Platinum. But hackers found out how to crack the game. But their are many codes out there for Pokemon Platinum that are similar to Pokemon Pearl. You just have to look on the AR website.
there is none but the only way to get all ribbons is to use pokesav and make a Pokemon that has all ribbons (note there is codes to get all ribbons but they delete ur Pokemon)
There are r4 cheat codes, download it from gbatemp.net then download the r4cce (a program that edits cheat files) use GOOGLE. Then follow ins. from youtube. Or follow my way. Put the usrcheat file (the 1 u downloaded) in the system folder in r4. then open it using r4cce. Find and copy Pokemon: Platinum (U). Open the CHEAT file in the ds and paste the codes there. And you now have codes for Platinum. Use this for other games that dont have cheat.
Bidoof
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.