This isn't the most important news, but....
Horde battles aren't restricted to wild Pokémon.
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It seems that the villains have actually gotten smarter, and finally started ganging up on players.
'Horde battles' appear not only as wild battles, but can be trainer battles as well!
-Translated from the official Pokémon site.
Pokemaster seems to be fairly active, but I thought I would post this anyway because it doesn't seem to be on the US site.