Update Smogon Doubles ORAS: Some tutors are back

The tutor moves for Leavanny and Sylveon are back and thus legal.
Also add Team Preview.
Update Seasonal Strikes Back: Add safeguard against hash collision

There's an improbable chance that a nickname gets a hash collision.
In such a case, the player gets five instead of six Pokémon.
This safeguard prevents that improbable event from happening at all.