I have 2 but the second one is kinda dumb
1- sacrifice ball-If you catch a pokemon with this ball and trade it to your friend with zero badges It will obey and if it doesnt a spike will grow in the sacrifice ball. When it doesnt obey you 100 times and you are so mad return it and it will die due to 100 spikes.
2- soccer ball- you use one to play soccer and to catch pokemon but if you catch a pokemon with one it gets pretty good at soccer.