All 3 Starters
Having all three starters can be very helpful especially at the start of the game,
You need two Pokemon Diamond games or A diamond and pearl and two Nintendo DS consoles.
First of all pick which game you want to have all three starters on, start it up and play it, selecting your starter etc. And also catch three of the same Pokemon, one for yourself and two for trades. Once you have done that save and go to the union room and wait.
Then you get the other game you play through and pick your starter a different one from what you have in your chosen game, then go to the union room in the Pokemon centre meet up with your other game character and trade one of the weak Pokemon for the starter and voila, do the same for the third starter and there you go
We have more cheats and tips for this game here, Pokemon Diamond cheats
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