It's the tile behaviour. The behaviour the computer uses can be set on any tile, and that tile will work like a PC (with the PC animations too... But they can be changed with Block Editor in Advance Map)
Eh, he perhaps knows more than me. I think manipulation, judging by what needs to be done. I have no clue.
But, wouldn't that just kinda... Well, ruin the point of it being a Ranger game, if you kept it, as it would be more similar in style to a general Pokemon game (like most hacks). Would be interesting if they were only 1 use, or receivable and then removable, or limit the number to 6 with no boxes.