3rd Gen Mt Battle (Colosseum)

So im going to try to complete Mt Battle for the Ho-Oh reward, this is my team

Articuno
Entei
Suicune
Raiku
Espeon
Umbreon

All of them are lvl 60, is this a good team combination?

Also, when i play through it do they let you save inbetween battles to the point where if i lose i can reset and try the same battle again, or does it have to be a consecutive 100 wins? (Ex: save at trainer 50, lose, reset, battle trainer 50 again)

I'm afraid this is the forum you are looking for if you want team help: http://www.pokecommunity.com/forumdisplay.php?f=269