this thing is called LAZINESS! you can see the same animations (like Brock throwing those 2 pokeballs) in several other episodes. the makers simply used the animations again
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Mewtwo writes:
The Pokemon can get out of their Pokeballs even if their trainer doesn't hold them. Maybe Brock held the Pokeballs at his belt or something.
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cody writes:
Misty has a backpack full of pokemon just so you know