well...use a load of dusk balls if its in night (thts how i caught giratina and mespirt ) and when the ball shines yellow say "gotcha" over and over again and legendary Pokemon such as palkia or in diamonds case dialga,if you havent got one of them,(this is just a tip) don't use ur master ball!!!!!! palkia/dialga are the most easyst to cach (beleve me giratina took me a whole day 2 cach if u have eny more quiestions make an acc on runescape(computer)(free) you can ask me eny thing its jacobskelton is the username!bye.
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The same way you would catch a normal Pokemon. The only difference is is that the Pokemon is shiny.
The best way is to get some codes online. Using an online forum is a great way to do this.
You can catch it at the Safari Zone in Fuschia City but it is rare. Throw rocks at it and make sure it doesn't flee so you can catch it easier.
You Cannot catch lucario on pokemon black the only Way is to trade him or catch a riolu.
Best non-legendary water pokemon would be Gyarados. Best legendary water pokemon is Kyogre.