that is acually a pretty good team but you could do better.i suggest you get one Pokemon of every type.
you can only get another by trading or hacking. Sorry.
no it cant because it is awesome and is really rare!
No, Giratina can only be caught at level 47 in the distortion world you need another orb to unlock its origin form.
Giratina's origin forme is not present in Pokemon Diamond only it's Altered forme. Whilst you can still attach the Griseous Orb to it, it will only boost Giratina's stats ,not change it's form, to do that you need to play Pokemon Platinium.
I believe It would be Dialga, Palkia, and Giratina. Both Dialgan and Palkia are found at Spear Pillar. Giratina is found in the Distortion World at Turnback Cave. Arceus is another but you need the Azure Flute in a Pokemon Event.
in the start of pokemon/pearl/platinum in thestart of either game they will give you a choice of piplup turtwig or chimchar if you choose chimchar you can evolve it in to monfertno after monferno it goes to infernape ;)
There is no Pokemon that is 'better' than another. That's for you to decide. Since infernape is newer i would have to say infernape.
if you dont catch giritina but you kill him, you dont have another chance enless you saved the game right before you tryed to catch him
You can either get it traded by the GTS in Jubilife City or you can trade it from another person. But in Platinum you could get all three (Dialga Palkia Giratina).
First of all, you spelled "which" wrong and you should leave out giratina. He's on the front, so he's the one another person would expect to see.
get the gracidea flower for shaymin to change and get some orb to change giratina there are about 5 different forms for rotom, another form for giratina and another form for shaymin
Get another game, (such as Pearl, Platinum or another Diamond, preferably Platinum as it is the main Legendary in that) which has captured Giratina, and trade it across. There is no other way with one game, without cheating, to get multiple Giratinas. Courtesy of Josh, England.