you walk in the tall grass at you kick something weird... you look down and you see a Kakuna it wakes up after you kick it, and it just looks at you with its sharp eyes it can't do much bc it is a cacoon, but I guess it just waits to evolve into a Beedrill ''Kakuna... KA!'' you are confused why is not on a tree or in a nest with other Kakunas... they never do it in grass