Why do I hear pokemon cries while walking on the road? (I'm playing leafgreen)?

Question

While I was searching for items in cycling road, using itemfinder, I suddenly heard Meowth's cry while walking. Also, while I was going to Lostelle in Berry Forest, I heard Hypno's cry. I do not have a Meowth nor a Hypno in my party when these occurred. What does this mean? how does these things happen?

Answer 1

You sometimes hear the cries of Pokemon who can appear on the Route you are on. Also, if the first Pokemon in your Party has the Swarm ability, you hear these cries more often (just a fun fact.)

Comments

What do the cries mean? Or, what do they even do?

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cries are just the sound the pokemon makes. Likes the beeps and high pitched noises when you're looking at them in the pokedex