Mew (WBSP 47). Not a bug per se, but more that the Mew card is displayed incorrectly. It's displayed as having zero retreat cost, when it should show 1. It's programmed correctly in the game as 1
------------------Begin Game Log------------------
The game is about to start
Type: Career
Format: Base–Neo
Battle begins between jamie756 and jamie757!
Coin flip [Opening Flip]: HEADS
jamie756 will start
Game setup complete
Between turns
Turn 1 begins
jamie756 drew 1 card
Put Mew (WBSP 47) onto bench.
TURN TIMER: a Timeout Allowance was consumed to add 20 seconds to turn time
TURN TIMER: a Timeout Allowance was consumed to add 20 seconds to turn time
TURN TIMER: a Timeout Allowance was consumed to add 20 seconds to turn time