Move Deleter crash with Gen 7 Pokemon

Whenever trying to delete a move through the Move Deleter in my game with a Gen 7 Pokemon, it crashes. Here's the error message that pops up (name of map 129 intentionally redacted by me after pasting the errorlog):

Exception: RuntimeError
Message: Script error within event 2, map 129 ():
Exception: NoMethodError
Message: (eval):1:in `pbExecuteScript'undefined method `pbNumMoves' for #<Interpreter:0xbca3098>
***Full script:
pbNumMoves(pbGetPokemon(1))==1
Interpreter:243:in `pbExecuteScript'
Interpreter:794:in `eval'
Interpreter:243:in `pbExecuteScript'
Interpreter:794:in `command_111'
Interpreter:320:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
Scene_Map:103:in `update'
Scene_Map:101:in `loop'

Interpreter:276:in `pbExecuteScript'
Interpreter:794:in `command_111'
Interpreter:320:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
Scene_Map:103:in `update'
Scene_Map:101:in `loop'
Scene_Map:114:in `update'
Scene_Map:68:in `main'

After confirming this bug I tried the Move Relearner to see if the same error happens there, but the Move Relearner has no issues with Gen 7 Pokemon. Would anyone happen to know what's going on from the error message?