Trade with another Pearl or Diamond.
Well this is one way you will need two Nintendo ds's and a platinm and diamond or pearl or platinum, just get a starter Pokemon in diamond in pearl or diamond and trade it into platinum, repeat this until you have all starters! If you have an action replay though, You can go to trainers who have the Pokemon, battle them, then capture their Pokemon!
You need a different game to get it if you don't have it. GOOD LUCK YOU'LL NEED IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11
you can see it just south of the Pokemon mansion on the rainy route there are two Pokemon rangers. one has an aipom one has a prinplup. but you can't get it from any one but a starter Pokemon.
Palkia, your starter (I chose empoleon), steelix, azelf, plus two of your choice. Make sure the level of your starter and palkia are at a minimum of 60, then it's quite easy.
you can cheat or trade with friends and if you do so you could breed with a Ditto(you can do this after the Pokemon league)
Trading or action replay. sorry if that was no help. :[
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!
trade
No, because you can only get one starter of your own per game. If you have someone else's other two starter pokemon, it will only work for them because it's the original trainer of those two other starters.
Save your game before choosing a starter Pokemon keep choosing the same starter until its a female.
dude you have to cheat for that
There are three times you get to choose a starter Pokemon.(Stater Pokemon will be different so don't get your hopes up.)You'll be able to choose one Pokemon.To get the other two trade with another player.