If you could invent your own Poké Ball...

[bwburke94]

A Heavy Ball that isn't glitched.

 

[The_Consumer]

The "Trainerball" - A Pokeball that could catch the trainer rather than the Pokemon in an opponent battle.

 

[pompayyy]

How about the Melody ball? A Pokemon who's cry is melodic or musical of any sort will have a boosted catch rate. And I know everybody hates pokemon based on inanimate objects, but a record (vinyl) pokemon would be great.