You can't at least if you are talking about Jirachi...
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how o you get a moghty roar in pokemon diamon
Wormadon. Wormadon Is the number 46 on Pokemon diamon
In battle, teleport will allow you to escape from wild encounters without fail (with the exeption of pokemon with the abilities shadow tag, or arena trap). Outside of battle, it will take you to the last pokemon center you have visited. This is the same for all other pokemon games.
YOU CAN'T! its a new Pokemon ONLY IN DIAMON AND PEARL and YOU CAN'T TRADE BACK TO OLD VERSIONS ANY WAY!!!!!!!!!
u go to pal park in Pokemon diamon pearl or platinum and then u trade to hg or ss which ever u have