You encounter Drilbur and Boldore!
Drilbur used dig!
(Next turn)
You throw Pokeball at Boldore!
(Note: this example is not real, meaning in a game there might not be any double battle with a Drilbur and Boldore)
Would you
A: Throw the Pokeball, and have a chance of catching the Bordore?
Or
B: It's impossible to aim with two Pokemon!