I believe all Nintendo events for Diamond and Pearl are over, and you can't receive them anymore. You couldn't even get them via wifi, only at exclusive places like toys 'r us. Now they will only have events for Pokemon platinum version only.
With the Japanese event or mystery gift
...in a pkmn ranger 1 game...or event...
You can only get it by Trading from Platinum, Diamond or Pearl. But you can only get the Griseous Orb via the Event.
you can't find larvitar in pearl. You can only find it in diamond.
You find Gligar in Pokemon Platinum at Route 206. You can't FIND IT IN PEARL.
event or action replay
new moon island (first you have to do the darkrai event first but to do that you have to do the creisila event and the shaymen event)
Fight everybody in the riolu event and a cherim will be there
You dont, you have to either get it from an event or action replay
You can't. You must go to a Nintendo event, cheat or hack.
With the Japanese event or mystery gift
You cant find it through regular gameplay. Its an event item gotten over wi-fi or at a local event.
The only way you can get Dakrai in Pokemon pearl and diamond is by going to an Nintendo event. There is going to be an event in America for Dakrai through selected toys'R' us on May 31st and June 1st .
A real-life event where you can download mystery gifts on Pokemon Pearl
one way is to simply use the action replay to find a code to give you what you need.
Its much easier to trade for it, You need a special event to get it in your game
It is a place where you find Shaiman. To go there you have to go to a pokemon event or have an action replay.