you don't catch. you get them you can get,regigigas, mew, deoxys, celebi etc. you can basicly think that most legndary PKMN. see bulbapedia for details
Mystery Gift.
you must catch it and purify it in Pokemon xd gale of darkness.
In july there will be a mystery gift for koletea
you can't. you need to do mystery gift
mystery gift
yes but i have no idea how i think it has to be a mystery gift event
you need a mystery gift or cheat or hack into the game
You can only using a Nintendo mystery gift.
You can catch Dialga, Uxie, Azelf, and Mesprit
you have to get the arceus event on mystery gift.
Unfortunately, there are no available pokemon for XY Mystery Gift.
You can only get a Mareep by using a Wonder Card which is used in Mystery Gift and with the Wireless Adapter that alters the Pokemon inside Altering Cave allowing you to catch a Mareep, Teddiursa, Houndour, Stantler, Pineco, and Zubat (Which is the only Pokemon you can catch without Mystery Gift.).