Or is it just recommended that they are level 5?
Yes they have to be Lv. 5
Yes, they must be level 5, and their movesets must be only moves that they can know.
For extra Little Cup information, click HERE.
How to change your username
How to add a user avatar
Why was my post hidden?
Flags vs Downvotes
Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.