While staying in the forest for nearly a month, Levi sent Duy and Inuyasha back to Konoha first to report the sightings that we have seen, it seems that some other pokemon species has initiated a war with the pokemons in the forest.
Every day there where fighting, but all that fought where the 1st form of the pokemons.
Their evolved form, and baby pokemons didn't go to war, even if the baby pokemon accidentally went into the battlefield, other pokemons would avoid them.
Perhaps there are also some rules in this war, that we've notice the few weeks.
1. Baby pokemon and 2nd - final evolution pokemon can't get involved.
2. No attacking at night
3. When other species enter the battlefield, eradicate them first before continuing to fight each other
4. They can't attack other pokemon that already surrendered
5. The surrendered pokemon will go directly into an area where there other pokemon that surrendered.