Where can you catch Mew in Pokemon D/P?

Question

Let me guess, it was another event I missed?

Answer 1

Yep, it is only available via event. It cannot be caught ingame.

Comments

Aw well...,but do you know any other event's coming up?

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As of now, no events are scheduled, and it is HIGHLY (I mean like never ever) unlikely that there will be any events for the older games like Diamond.