A transition is a way of making the screen turn black, in order to start a battle. There are a number of transitions in Essentials, and one is randomly chosen each time a battle occurs. The same transitions are available for trainer battles as wild battles.
However, trainer battles may instead display a VS. animation, an example of which is on the right. This animation will play instead of a random transition only if the appropriate graphics exist. The required graphics are:
- Graphics/Transitions/vsBar42.png
- Graphics/Transitions/vsTrainer42.png
The number (e.g. 42) is a trainer type ID, which means a VS. animation will play for every trainer with the same trainer type (as long as the required graphics exist for that trainer type).
There should also be copies of the above graphics for the player's possible trainer types. There are also a couple of other graphics and sound effects used in this animation. However, none of these are checked for first - it is assumed that they all exist if the listed graphics above exist.