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You CAN catch over 500 pokemon. Its hard to display, so maybe go on a website that displays all of them. Theres 2 pokedex's. The pokedex and the national dex. Hope it helped! sorry if it didnt!
depends you can use the master ball and get it in one go without attacking or you can weaken it and throw a premium ball because you only get 1 master ball
not possible. You cannot possibly catch Pokemon that's just not coded into pearl unless you trade with a diamond user. Pokemon such as dialga, cranidos, and stunky cannot be caught in pearl. Getting...
You use a poke ball, great ball, ultra ball etc. To be honest I think the best ball for Palkia is an ultra ball. It's really easy to catch so don't go wasting your master ball on it.
There isn't a "way" to get Shiny Pokemon, you get them only by wild encounters. Make sure to watch extra-carefully if a Pokemon you find in the wild is shiny or not, because I encountered a wild...