edit your post:
You can not find a pokeball unless I say you do. That is one of the point of RP. And you can't catch a pokemon unless I say it's caught... If you do this you would be considered godmodding which is unfair for everyone else as you are determining things that are not within your boundary. Your supposed to make a post about finding an item, and I determine what it is, if it is a pokeball then you get to work with that.
And you end every "capture" with (the ball hit the pokemon and it began to roll) or something like that, so I determine by the quality of your post if it is captured or not)
You have not captured the Taillow yet as you do not have a pokeball...