you can only do it in two ways.
1. the hg/ss event arceus
2.use action replay
my friend said that you need palkia giratina or dialgla and trade it to get a arceus I'm not sure if that's true
dialgla doesn't evolve
4 palkia is mishcievious Pokemon to catch
Palkia doesn't evolve according to level in Pokémon Platinum because it's not capable of evolving.
i have palkia for trade
Palkia is at level 48
heatran can be captured after getting the national pokedex. he is in stark mountain in the last room. you cant get dialga in pearl only palkia. however you can get a dilaga through gts or trade
Palkia is level 48
It s a level 1 if you use the arceus event. If you trade it well....
Palkia learns Spacial Rend at level 40.
There is NO such thing as Killalgla, it's NOT in the pokèdex.Trust me, my Dialga is level 100, and it hasn't evolved.Whoever told you Killalgla exists is a LIAR.
his level 47