Before I begin my explanation, I self title this the StratManJan (a very different title than the RatManJan Strat)

For the Bowser games in All Characters, it is ideal to get hit by the ball to get on base easily. However, you can only get hit by the ball when Bowser pitches extremely inside. With the StratManJan, however, you can change Bowser's pitching position, causing him to pitch more inside or outside. A video of the strat:

As you can see in the video, pausing the game after Bowser has taken position but before he winds up his pitch causes him to go to another position. This almost guarantees getting hit by the ball, as it causes a shift in his position. Additionally, this removes all randomness that may come with hitting the ball with any of the Kritters or Petey. You of course can pause multiple times to shift his position more if you need to. Be careful though, as when he begins winding up his pitch, you cannot pause, making his position final

neat! good find - I also believe that Bowser Junior can bean the Kritters which would also help for those missions