nope
Firstly its Darkry not dark cry and secondly its a Pokemon obtained by hacking pearl or diamond.
You can only get Mewthree by hacking it into the Pokemon Pearl ROM. It cannot be obtained legitimately or by using the Action Replay.
the tweaking glitch means one of your Pokemon is poisoned
I'm sorry to say but mewthree is a fake Pokemon it's a Pokemon sprite and can only be obtained through complete hacking and I wouldn't bother with that
Glitch for it! On Google type in: Tweaking glitch for Pokemon Platinum. find out how to do it and then Type in: How to get darkrai using the tweaking glitch on platinum.
There is no legitimate Dark Pikachu that can be caught in game, it can only be obtained through ROM hacking. However, shadow pokemon exist in Pokemon Colosseum (but that's not dark).
You can not. Mesprit ca be obtained in the following games:Pokemon DiamondPokemon PearlPokemon Platinum
Celebi. It can only be obtained in Pokemon Crystal (which isn't compatible with gen. 3-4) and only in Japan. The item to obtain it with is called the GS ball. It was only given out in one Nintendo event via mobile phone. Celebi can be obtained through hacking, but it will not obey.
mystery gift cheat action replay tweaking glitch
Actually. Arceus isn't legitamely obtainable in Pokemon Platinum. Or any 4th generation game for that matter. The coding for the hall of origin and arceus and his pokedex entry and everything is programmed in but the event item to access the Hall of Origin has never been officially distributed so you cannot obtain an Arceus without hacking or tweaking(although tweaking next to impossible).
by hacking
Making a copy of a Pokemon by hacking or glitches.