Wow, the Meta in your area must really be hard to play against then. In my area (which is the only reason i am suggesting this) Magmortar is all but gone, with 0 played at the first Autumn BR and 1 at yesterdays BR. Leafeon packs a big punch if you pair it with more NRG Acceleration, or maybe a 1-0-1 Sceptile Line. Leafeon is like the new Blissey except you can set up your other pokemon and still do big damage. Leafeon is Boost/DRE/Scramble Useable, while Boost doesn't help Glaceon, If it uses DRE, it's attack takes a big hit since you are hardly doing damage at all, but Glaceon can use Scramble.
Mass Power? Well, i already explained Leafeon. NOW! Glaceon may not pack a big punch, but with 70 and the possibility of 20 too the bench, and if you are using the right Glaceon (IMO) you can for 2 energy, spread some more damage, or for 3, do 60 and Sleep.
So, like i said earlier, the best Lv.X Combo would be 2 Leafeon, 1 Glaceon