If you visit the Big Stadium in Nimbasa City , you can head out onto the field and take on a few trainers each day. The types of trainers depend on which day of the week it is when you visit. You will be able to battle different, more powerful trainers the higher your badge count is.
The only time that you can't battle the trainers is during event hours, which is when the actual sports matches are being played. Any other time is fair game though, even 3am! Feel free to come here from day to day to train! The Big Stadium's counterpart is the Small Court which functions in a similar way.
|Baseball||Sunday, Monday, Thursday||Infielder|
|All||All (5+ badges)||Backer|
Note : After beating the Pokemon League, a wider variety of non-sport Pokemon trainers, ranging from Ace Trainers to Youngsters, will begin to visit Big Stadium too.
|Badges Obtained||Pokemon Levels|
|3 to 4||24 to 26|
|5 to 6||31 to 34|
|7 to 8||45 to 48|
|Postgame||61 to 64|