I like to use boxes to make various sets and being able to quickly check any bad apples in the box is good at cleaning them up. Obviously I'm not using a box as a team but it still says that my team is invalid because of it. Not only that, it overwrites other reasons as to why it is. Heres some images:
This Manaphy is in that same box, it should also be saying "Manaphy is banned" (this is convergence, Manaphy is banned), this Manaphy has no moves and more.
This Manaphy is in that same box, it should also be saying "Manaphy is banned" (this is convergence, Manaphy is banned), this Manaphy has no moves and more.