beat the elite 4 and complete the sinnoh dex
Go to Mount Coronet on till you find somewhere you need to rock climb up, you can find your way from there and, defeat Cyrus.
battle them i guess
using a Pokemon event
pass mt cornet to the top of the mountain where there is mesperit, azelf, uxie, and plkia
Yes, you can trade them from diamond and pearl
You cant
I think you can only pass Pokemon from Emerald to Diamond/Pearl
The Membership Pass can only be obtained using an Action Replay. The event for this item has ended for Pokemon Diamond, Pearl, and Platinum.
Nintendo event
it depends which man
well i used grotle but you should have Pokemon about lvl 10+ it should be a little easyer
There is no such thing as a "rainbow pass" or there is some diffrent name for it.