Article: You are given Safari Balls, which have the same catching power as Great Balls.  They will be less likely to flee, but they will also be harder to catch.

What is a summary?
Visit the Safari Zone in Fuchsia City. Use rocks to make Pokémon easier to catch, but they will become more likely to flee. Use bait to do the opposite. If you catch a Tauros or a Chansey and raise it up, few enemies will stand up to you.