How do I catch rare Pokemon in the Red/Blue Safari Zone?

Question

Trying to catch Kangaskhan in Blue. Whenever I throw bait, poke balls miss and whenever I throw a rock, it decides to run. How would I catch it? It's the last Pokemon I need for the Pokedex.

Comments

The key here is patience. It will eventually want to be in a Pokéball. Another key here is luck. There will be a slight chance that the Pokémon will not run away after you throw rocks at it and will get in the Pokéball.

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Also, don't move in the grass, simply change direction on the spot. This will cause wild encounters without costing steps

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Rocks don't make a Pokemon less likely to run away, Bait does. Rock make a Pokemon more likely to run away. Also, Bait halves the catch rate of a Pokemon and Rocks double it.