Celebi

I can answer both of those questions at once: you can't!

Celebi is pretty much unattainable, without cheating.

Well to get Celebi, there are a few Options you can use to hopefully, acquire a Celebi. 1)You can use an Action replay DS, find the code for Celebi, put the code in, and BAM! A Celebi that you can do whatever you want with it.

2)If you have a Celebi on Poke Fire red, Pokemon Leaf green, Pokemon Emerald, Pokemon Sapphire, or Pokemon Ruby, then you can migrate the Celebi to Pokemon Pearl, after you beat the Elite four, and get the National Pokedex.

3 If you have a a friend who has a Celebi, then see if he/she will trade you, that's about all you can do.

You can't catch Celebi in any game, unless you use a Gameshark or Action Replay.

You can't catch it

They are all right about that not catching it without cheats

Play Pokemon jhoto, get some kind of event, then headbutt a tree in the forests

I may be completely wrong but I think you get palkia, Dialga and Giratina in your party then go to hearthome, prof oak will be there he will talk to you and tell you where to go.

You can get him what you have to do is go to the cave near solaceon town and fight a hundred unown at the last floor then your then keep running around after you will meet up with celebi your welcome

I don't think you can catch him!

Well i am not sure i have tryed lots of ways i was told if you that if you defeated 100 unown on the last floor of the cave place with all the unown that after you defeat the 100 unkown you would run into celebi i defeated 125 and didn't i am still trying to see if there is a way to find celebi without cheating good luck

Ive heard that you have to defeat 100 unknown then run around the last floor on the solaceon ruins and then run around until you see celbi

You could get it from the wifi trading centre and trade someone from over seas to get but the name of it might be in japanese.