>>14596402Each E.V has a different effect on how the Pokémon performs in the training. Atk and SpAtk increase shot power, Def and SpDef improve charge time, HP improves shot accuracy and resistance, and Speed increases hover and shot speed.
The grey punching bag doesn't do anything on its own, however if you keep hitting it there's a chance with each hit to spawn bonus punching bags, which you can select from the lower right. These bags can do anything from giving EV bonuses to improving training performance. The team Flare bag improves the rate at which Pokémon punch on their own, which they'll do every so often if you leave the training window open.
If you see your Pokémon bouncing up/smiling and down, it means they're feeling energetic and will hit the bags faster. If they're lying on their side, select them to help them recover and they become more energetic.
Clear each Super Training course once to unlock the next level of training courses.