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Replace everything on line 118 of the PokemonPauseMenu script with this:
Code:
commands[cmdTrainer=commands.length]=$Trainer.name if $game_switches[YOUR_SWITCH_ID_HERE]
also, replace "YOUR_SWITCH_ID_HERE" with a number representing the switch ID you want. (Turning that switch on will show the trainer card option and turning it off will not show it)