>>52278734being extremely picky about the pokeball you use to catch a pokemon with based on color, theme, etc.
For example some people will only train a competitive clefable in a heal ball because both are pink, but I will only use a moon ball because it fits its theme more and I think heal balls are ugly. The ball will often change depending on if the pokemon is shiny or not, since they want the shiny colours to match the ball.
