This month his bringing a series of returning Mega Battle Raid bosses and now that Mega Venusaur is undeniably wrapped up.
Shadow Raikou - Thunder Shock/Wild Charge Shadow Magnezone - Spark/Wild Charge
Shadow Zapdos - Thunder Shock/Thunderbolt Zekrom - Charge Beam/Wild Charge Shadow Mewtwo - Psycho Cut/Thunderbolt
Mega (or Shadow) Venusaur - Vine Whip/Frenzy Plant Tangrowth - Vine Whip/Power Whip
Players will need to gauge the upsides and downsides as they figure out which Pokemon to plan for the huge fight.
Pokemon that are probably going to be significant again in future fight attacks or PvP exercises past the current week's Mega Raid.