Question

I have a nudging suspicion that it does...

Answer 1

No,it's not.

edit : seems like I was wrong

http://bulbapedia.bulbagarden.net/wiki/Catch_rate

it appears that it increase chances every time you throw a ball

I apologize for the confusion

Comments

You sure? then how come it always takes me the same amount of pokeballs to catch the same pokemon? If it is soley based on chance???

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You know I too think it does because that same thing happens to me when I am catching legendary pokemon.
i kinda think a pokemon gets tired or someting like that

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This is incorrect. Nowhere on that page does it say that.