RE: I don't get Yanmega/Magnezone.
If you're going for the magnezones then you will have to burn all of your reversals/other resources while they are playing practically nothing and picking off yanmas/yanmegas so in the late game you won't have any way to counter the yanmegas so you will lose.
If you're going for the magnezones then you will have to burn all of your reversals/other resources while they are playing practically nothing and picking off yanmas/yanmegas so in the late game you won't have any way to counter the yanmegas so you will lose.