get a high level Pokemon that can use mean look ,mean look keeps a Pokemon form running away or flieing.
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Using a master ball
no
an ultra ball. if its in gba good is one ,,cheat'' use b and down arrow.
Too catch raikou you must first get rock smash and teach a Pokemon the move. then you go to burned tower in ecruteak and navigate it. fall through the hole and walk forward and you will find the 3 legendary dogs they will run. then get the strongest repel possible and duplicate a master ball when you find it catch it with the master ball
Of course, a Master Ball catches any Pokemon without fail, Legendary or not.