well i beat soul silver,you need a zubat,golbat,crobat,gastly,haunter and gengar that knows mean look.find raikou(it will show you raikous face on the pokegear)(dont fly or dont ride bike just walk)when you run into raikou use mean look then it cant escape then parilieze it and get its health bar to red then throw a fast ball(give a white apricorn to curt and wait a day and youll get 1 fast ball)try to get alot of fast balls at least one doesnt work for you.
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i would say Ultra-Ball so you could save the master for Entei Suicune or Raikou pokeballs are the best balls you can use just use one of them and then do the A/B trick(hold a and b at the same time) and it should catch!
you can put it to sleep/paralyze it etc. than use 100+ ultra balls
weaken it to red heath and then put in to sleep and use a ultra ball and hold l+ab+follow the pokeball movementbut before all of that use mean look so he can't escape
an ultra ball. if its in gba good is one ,,cheat'' use b and down arrow.
A masterball would be the best choice but if you want to save it, you should use a Pokemon that does not let him flee (he always flees after the first turn) and use regular pokeballs or ultra balls