Attack Gym using Dittos and meet another Ditto

A Ditto in Gym will turn into the very same Pokémon as it is facing in battle: When the Ditto fights a Murcrow, it becomes a Murcrow itself.
And surprisingly it will even turn into a legendary Pokémon of the same kind when it is attacked by or attacking a legendary.
So eventhough you can’t insert a legendary Pokémon to defend Gym, when you leave a Ditto in gym, it will become a legendary Pokémon when attacked by one.
A Ditto can only have one type fast attack (transform) and one type charged attack (struggle). But the true wonder of the Ditto is its ability to take the form - and attacks - of the opponent.
What hoppens when the Ditto meets another Ditto? The Dittos stay Ditto!