The same way you do for every other Pokemon.
no there is not a way but u can trade pokemon form pokemon MDE of darkness to MDE of sky same with items u can do it through the main menu
Time you can recruit Celebi and Darkness you can recruit Mewtwo
No,you can only recruit it in the Time version.
Yes,you can recruit heatran in giant vulcano
you can not recruit mew but you can recruit mewtwo cya later
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to get kirlia you must recruit a ralts at a certain level then go to luminious spring and evolve into kirlia
yes, you can recruit it. you don't need any cheats at all, at least i didn't.
Nope
Yes
NO ONLY ONCE...VERONICA
Only in time darkness and sky