What happens if you have a full team when you catch Reshiram in Black?

Question

I've heard that it is automatically put in the front of your team for the N battle, but what if you have a full party? does one of your Pokemon get booted to the PC? what determines which one it is?

Comments

I would think that it would go to your box, but...

---

If your party isn't full, any Pokemon you catch will automatically be put into your party, right? If my memory is correct, it asks you if you want to add it to your party.

---

I thought that was introduced in Gen 7 though

Answer 1

After the Legendary Pokémon is caught, the player has the option to add it to their party. This capture is forced, unless the player's party and PC Boxes are all full, in which case, the Legendary Pokémon will respawn at Dragonspiral Tower during the post-game.

If you catch Reshiram or Zekrom, and your party is full, you have to option to send one of your party member to the PC in exchange for it.

Source