Yes there is a code for that. However I do not have it. Check on Supercheats.com
You will have to get a friend to start the game over and over so he can trade over the starters
Diamond, pearl, and other platinum versions
trade from other games
you have to trade them from other Pokemon games
Get a cheat device. In other words, you can't do it legally
no he's in other pokemon games
you can catch alot of Pokemon that are not in the other games.
Yes, with Diamond/Pearl and Platinum.
To get all three sinnoh starter Pokemon, you need 2 Pokemon sinnoh games & two ds's. you also need to be able to trade. on your platinum, say you picked turtwig first, go to your other game on the other ds & pick chimchar. put up a trade for a easy Pokemon to catch, eg bidoof then on the platinum game trade it other. you will then have turtwig & chimchar. do the same for piplup.
you see all the Pokemon in platinum and trade from your other games like emerald, blue, fire red etc and that is how you find all Pokemon in platinum.
You have to transfer from other games so no
You have to choose one then trade it with a friend, start again get a different starter trade this one to a friend, then start again chossing the only other starter Pokemon get the other two back from your friends and you have all three!