Its always too hard to catch. But you can use a Master Ball right away or a Quick Ball. Occasionally, if its weakened, you can throw a lucky Poke ball at it. That's how I got my Dialga!
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You need to catch Giratina or beat Giratina after that go to Lake Verity. You need HM Surf...
Yes, but if you want to catch giratina later you can go to turn back cave.
catch or kill giratina the you'll go to sendoff spring haunter is somewhere there. NOTE if you dont believe me kill or catch giratina go in the portal where giratina was then look on the map!
catch/defeat giratina
Yes you can, but i suggest u catch him with dusk balls.