Mega Altaria can be defeated with two trainers, but if you cannot guarantee the top counters with maxed-out CP and the best moves, your best bet is to make sure you have three or more players.

If you're dropping in on Altaria with a crew, you'll want to ideally shoot for between 3 and 6 friends. The Raid Boss CP on this Pokemon is 44306 – it's no joke! Once you defeat Altaria, you'll ...