Apart from the combos that has already been mentioned, Heatran LV X can work with Magnezone decks too but only if the Magnezone deck is base around the board control strategy...
Possible. I've seen people playing it before...
As for the topic, I would suggest playing 2 Dusknoir SF(Shadow Command), 1 Dusknoir DP and 1 Dusknoir LV X. Dusknoir DP can give you an edge by limiting your opponent's Bench to 3 which can be hurting to some decks that require big benches like...
Flygon LV X is kinda disappointing with its attack. As for the rest, they are decent but Gallade 4 LV X caught my attention because of its artwork... XD
Agree. Vire can constantly recharge your Magnezone while Kiss can only pump once than, it becomes useless in your Bench UNLESS if you play SSU and have good skills in flipping...
Maybe. It will be hard for Infernape decks to hang around in the metagame(current and next) due to the large amount of water decks around. Currently, is Empoleon decks. Next format, Kingdra will join the metagame...
I don't think the rotation would affect much on the Fossil lines since we now have Dome Fossil, Helix Fossil and Old Amber and the best part of all is, we can play of them if you want to compare to when all evolve from Mysterious Fossil...
Base on your topic, it is kinda obvious that you did not try playing Cresselia LVX or did you but it fail?? Anyway, if you know how to manipulate it in a deck, you will find it good & useful...
POKEMON(19)
3-2-3-1 Infernape MD(3)/Infernape LV X(1)
1-0-1 Alakazam MT
2-2 Claydol GE
3 x Pachirisu GE
1 x Sableye CG
TRAINERS(24)
4 x Rare Candy
4 x Bebe's Search
2 x Night Maintenance
3 x TV Reporter
2 x Roseanne's Research
3 x Warp Point
1 x Windstorm
1 x TGW
1 x Cessation Crystal
3 x Plus...