My suggestion is to add a trash button on the caught preview and once clicked, the player will be prompted to release the recently caught pokemon. It would help reduce a build up of trash poke when hunting, save the player alot of time and increase productive yields. If that's asking too much, at least have it as a option when you have only 30 boxes left and need to release one. I don't think it's much of a huge issue but I think it just improves the quality of hunts and creates opportunity for late game shiny encounters.