Wow thanks for the extensive anwer! The scizor isn't really a must have for me, but after the research I did he seemed to be a nice suplement that can make up for some of Mega Charizard X his weaknesses (mostly Stealth Rock, and I prefer Defog over Rapid spin, at least on paper.) .If you're running defog and U-turn, it's a UtilityZor, with a set like this:
move 1: Bullet Punch
move 2: U-turn
move 3: Defog
move 4: Roost / Pursuit
ability: Technician
item: Leftovers
nature: Adamant
evs: 248 HP / 44 Atk / 216 SpD
(credit to Bribery, the OP of this set)
Since you're not running Superpower, you can't deal with either Terrakion, Lati@s, Garchomp, Mamoswine or Gyarados: CharX's 5 biggest threats. If you really want to run Scizor (shame it can't be MEVO, would help in this situation) make an odd amendment to this set and run:
move 1: Bullet Punch
move 2: U-turn
move 3: Defog
move 4: Superpower
ability: Technician
item: Life Orb
nature: Adamant
evs: 248 HP / 44 Def / 216 SpD
You can 1HKO Latios with U-turn, 1HKO Revenge Kill a CB Terrakion if needed after taking a Close Combat, though dying about half the time to life orb recoil:
252 Atk Choice Band Terrakion Close Combat vs. 248 HP / 44 Def Scizor: 280-330 (81.63 - 96.2%) -- guaranteed 2HKO
It easily 1HKOs Mamoswine. However, there's still a slight weakness to Terrakion, and a large weakness to Garchomp and Gyarados. Throw in a bulky Rotom-W, the ultimate Gyarados threat, and Azumarill to revenge kill Garchomp and Terrakion. This gives you a fantastic bulky offense core.
Bulky Attacker Rotom-W:
move 1: Volt Switch
move 2: Hydro Pump
move 3: Will-O-Wisp
move 4: HP: Ice
ability: Levitate
item: Leftovers
nature: Modest
evs: 232 HP / 56 SpA / 220 Spe
All-Out Attacker Azumarill:
move 1: Aqua Jet
move 2: Play Rough
move 3: Waterfall
move 4: Superpower
ability: Huge Power
item: Choice Band
nature: Adamant Nature
evs: 168 HP / 252 Atk / 4 Def / 84 Spe
Then, to compensate for the lack of a pursuit trapper due to Superpower UtilityZor, i'd get one and perhaps throw in Galvantula for sticky web, helps with the revenge killing Terakkion and Garchomp. You could lead with either the typical Sash'd Galvantula to set up Sticky Web (check my previous post in this thread) or CharX to avoid taking damage from SR later in the game before Mega Evolving. Just brainstorming at this point without any real figures, but whatever suits you :)
Might come back to edit this, just wanted to post what I had! Hope this helps.
Rotom seems like an interesting choice :)
In this thread I also read quite some mention of a Charizard X combined with Aegislash, but I fail to see the logic behind it. Most people say they do it because Aegislash is a Fairy killer, which is good for MOST dragons but.. Charizard isn't weak against fairies at all because of his Fire/Dragon typing so I fail to see the logic between that combo :/ Not saying it's bad since I am very interested in it myself, but it doesn't seem to be good for the reasons people give it.