I finished the game last night and going to start Y soon so that I can get Tyranitar, Mega Charizard Y, Manectric, Yvetal, and Kabotops.
When I beat the e4 in X my team was
Eclipse (charizard X)
Deltron (Noivern)
Azazel (Tyrantrum)
Oni (Haxorus)
Koopa (Chesnaught)
Pachuco (Heliolisk)
Deltron and Azazel are in their late 50s and the rest of the team are in their late 60s.
The first two are alittle underleveled because I just Bred them, Maelstrom lent me his female Tyrantrum so I could breed it with Oni so that Azazel could have Dragon Dance... Tyrantrum is Rampardos 2.0 and I strongly approve
Gonna start my Y playthrough as soon as I find Garchompite and Bannettite