I've been thinking about this, like a mechanism to catch pokemon, since it's up to the game, and not to the player to catch the pokemon. Here's what i came up with:
A pokemon that has full HP is difficult to catch, and as it gets weaker, it is easier to obtain. Now that is up to the game, to randomly catch the pokemon, and one is pressing buttons, or praying to the game for the pokemon to be catched.
Now, how about if it was up to the player to be able to catch the pokemon, and see how difficult it is to do so. The DS has two screens, well the bottom one we see a pokeball once the pokemon is being captured, but wouldn't it be more "broad" to make a mechanism where one takes the stylis (sorry if typo) and is able to make some movement (around the used pokeball) to catch the pokemon, and one has to "follow" the steps in order to catch the pokemon. And of coarse, it is difficult at first, but as one weakens the pokemon, the pokemon will be easier to catch.