I am trying to avoid that as much as possible. I tried cheating to use legendary Pokemon but it really didn't give me too much different results. And what do you mean it isn't fair in the 7th battle?
Beating the council for the first time with pokemons on level 60-70 shouldn't be hard ._. Do you have a lot of revives, full heals and hyper potions? I'm always having 20-50 of each. Which elite is killing you?
Ohhhhhhh haha its okay. Well, it isn't like there is any definitive reason. So far, the best reason I can come up with has been bad luck and sometimes my team was week to one aspect. Like when I used Azelf, Heatran, and Salamence, a good Water type could hurt both Heatran and Salamence, considering many Water types use Ice type moves.
Have good EV/IV and a good strategy ready with mostly Sweepers. Smogon has some excellent strategy guides and can help out a bunch with building a nice team so I'd check that out.