[Scripting Question] How to make player borrow a Pokémon from NPC?

[Pinkietron]

I'm trying to set up the first area of my game and the player needs to traverse a forest to get to the area where they receive their starter.

How would I set up an NPC to give the player a Pokémon then give it back after the player receives their starter?

 

[WarDrago]

Just add Pokemon and delete after You got Starter Pokemon