In Dynasty mode, select the "Team Management" option. Then select "Create/Edit Player". Enter one of the following first and last names to activate the corresponding cheat function.

All challenge items
Enter David Hamel as a created player name in Dynasty mode.

Four star challenge items and all alumni facilities
Enter Scott Forbes as a created player name in Dynasty mode.

One star challenge items and batting cage alumni facility
Enter Andrew Florey as a created player name in Dynasty mode.

Three star challenge items and batting cage, bullpen and practice field alumni facilities
Enter Justin Cudebec as a created player name in Dynasty mode.

Two star challenge items and battling cage and bullpen alumni facilities
Enter Geo Sarria as a created player name in Dynasty mode.