The Trainer Card transition screens appear in Pokémon Red, Blue, Yellow.
When the game is being run on an original Game Boy (DMG) system, it is possible to momentarily see two transition screens while opening or closing the Trainer Card.
In the first transition screen for opening the menu, the player can see graphics of Brock and Lt. Surge's face, even if all badges were obtained.
In the second transition screen for closing the menu, the player can see part of top and second text boxes but with an ordinary text box (like on the start menu index). Additionally, the bottom text box tile is replaced with "ぇ", and the circles next to "BADGES" are replaced with "ぉ".
Transition screen while opening the Trainer Card.
Transition screen while closing the Trainer Card.