There is a tactic you can use to throw Pikmin much, much faster then you normally could. First you have to understand how it all works. Generally the speed at which you throw Pikmin is quite constant, due to the fact that each time you throw one the next one has to walk up and take its place. So what this tactic does is bunches them all up so that they barely have to move, and you can throw as fast as you can click the A button.
You have to use the C-stick. What the C-stick does is moves Pikmin around. Not only do the Pikmin move, but they start to bunch up, and you can make up to 100 Pikmin stand right beside you, as close as four normally would. It eliminates the time needed for Pikmin to get close to you before you can throw them.