I heard it is shadow force.
Caterpie
in spear pillar of course
explosion 250 power
I know that there are 2 super rare ultra powerful Pokemon in the whole entire Pokemon world.Those Pokemon are Raquaza and Arceus, but what i know is that RAQUAZA is by far the most and i mean the most powerful ultra legendary in the entire Pokemon world.
Lugia Mewtwo Mew Deoxys On Diamond, Pearl and Platinum Arceus is the most powerful. You can only get it by using action replay.
I'm fairly certain that if you go to the department store and try buying TMs, you can buy thief, then teach it to most dark or ghost type Pokemon.
The fifth gym leader is Fantina and she uses Ghost Pokemon. No element is strong against ghost except ghost, so just use your strongest Pokemon. But be careful - ghost to ghost is super powerful, but unless your ghost Pokemon is a much higher level than hers, do not use it since her attacks will be super effective against you. The best Pokemon to have are just a well-rounded team with most of the elements covered.
insidious
In concern to Diamond and Pearl, Platinum offers no new Pokemon, but offers 2 new forms of Legendary Pokemon, Shaymin and Giratina and 5 new forms of Rotom, the Ghost Pokemon. If you are retaking up the series again there are now 493 Pokemon in this version, with most being obtainable trough normal means.
The strongest Pokemon in Platinum is probably Arceus, to get Arceus, you need a mystery event, but that event is finished now. :( The second strongest Pokemon would probably have to be Giratina, or probably dialga or palkia.
The best,strongest,and most powerful ghost
Golden Arceus