Can I create custom battle rulesets in Gen 7?

Question

I want to have an option in Linked Battles for the following:

Single Battle

Set level up to 50.
Special Pokemon allowed.
Up to 3 Pokemon allowed.
Duplicate Pokemon/Items not allowed.

Comments

You can definitely get your opponent to agree to follow custom rules, but I don't know how you can get your game to automatically enforce them.

Answer 1

If you're playing on the 3DS, Free Battles with Restricted Pokémon allowed is going to let you do 3v3 at level 50 with all mons in the game.

source (and a good place to ask any more Battle Spot questions)