This guide will show you how to edit the game data to enable the console and edit other arbitrary values to your liking.

You will need the UndertaleModTool by the UnderminersTeam from github. [github.com]

tldr:
• open data.win,
  
• go to gml_Object_obj_Debug_Create_0,
  
• set DebugMode = 1;,
  
• go to gml_Object_obj_GAME_Create_0,
  
• set AllowConsole = 1;,
  
• edit other variables as you wish.

Example of unlimited restocks:

Example of how the console looks:

Install UndertaleModTool from link above
Go to the game's local files
Open data.win with UMT
In the top-left search bar, search for "DEBUG_Create"
In the file under code, edit DebugMode to 1
Search for "GAME_Create"
In the code file, edit AllowConsole to 1
Search through the file for any other variables you'd like to change
(You can change the maximum restocks here)
Once you're done, hit ctrl+s to save and overwrite the data.win

Hooray! Your game should now be edited!
If done correctly, you should see these strange, mysterious hieroglyphs in the top-left...

Press shift+enter to open the console. I'm sure you can figure the rest out from here (since the game explains it)