Hey Jof, here is the rate for your team. It are just some suggestions so look for yourself what you do with it. First of all I noticed your team doesn't get much support with the Sun up so I changed a few things:
Charizard X > Charizard Y, You had nothing that benefit from Sun so I changed it to this fellow Zard.
Charizard @ Charizardite X
Ability: Tough Claws
EVs: 252 Spd / 252 Atk / 4 HP
Jolly Nature
- Flare Blitz
- Dragon Claw
- Swords Dance/Dragon Dance/Roost
- Protect
+2 252 Atk Tough Claws Mega Charizard X Flare Blitz vs. 252 HP / 0 Def Mega Kangaskhan: 522-615 (126 - 148.5%) -- guaranteed OHKO
I think the moveset explains itself to be honest. 3rd slot you could run Swords Dance alongside with Tailwind Togekiss.
Togekiss @ Sitrus Berry
Ability: Serene Grace
EVs: 184 HP / 120 Def / 200 SDef / 4 SAtk / 4 Spe
Bold Nature
- Protect
- Tailwind
- Roost
- Dazzling Gleam
252+ Atk Terrakion Stone Edge vs. 184 HP / 120+ Def Togekiss: 302-356 (84.5 - 99.7%) -- guaranteed 2HKO
-1 252+ Atk Mega Tyranitar Stone Edge vs. 184 HP / 120+ Def Togekiss: 240-284 (67.2 - 79.5%) -- guaranteed 2HKO after sandstorm damage
252 SpA Mega Manectric Thunder vs. 184 HP / 252 SpD Togekiss: 266-314 (74.5 - 87.9%) -- guaranteed 2HKO
-1 252+ Atk Huge Power Mega Mawile Iron Head vs. 184 HP / 120+ Def Togekiss: 278-330 (77.8 - 92.4%) -- guaranteed 2HKO
I don't think I should explain these EVs? The damage calculations say enough. Dazzling Gleam gives more coverage and Roost is there to recover some more HP. Fake Out Top helps you to set it up.
I dropped Trevenant and changed it to Amoonguss since it gave you a way to put pressure on someone in TR.
Amoonguss (M) @ Black Sludge/Rocky Helmet /Sitrus Berry
Ability: Regenerator
EVs: 252 HP / 84 Def / 172 SDef
Relaxed Nature
IVs: 0 Atk / 0 Spd
- Giga Drain
- Protect
- Spore
- Rage Powder
-1 252+ Atk Choice Band Talonflame Flare Blitz vs. 252 HP / 84+ Def Amoonguss: 342-404 (79.1 - 93.5%) -- guaranteed 2HKO after Black Sludge recovery
Hitmontop looks fine
Rotom-W @ Sitrus Berry/Leftovers
EVs: 252 HP / 44 Def / 4 Sp. Atk / 180 Sp. Def / 28 Spd
Ability: Levitate
Calm Nature
- Thunderbolt
- Hydro Pump
- Will-O-Wisp
- Light Screen/ Protect
Spread from Eggy Emporium
252+ SpA Mega Charizard Y Solar Beam vs. 252 HP / 180+ SpD Rotom-W: 244-288 (80.2 - 94.7%) -- guaranteed 2HKO after Leftovers recovery
Bisharp @ Life Orb
Ability: Defiant
EVs: 228 Spd / 252 Atk / 28 HP
Adamant Nature
- Knock Off/Night Slash
- Sucker Punch
- Iron Head
- Protect
With Tailwind he outspeeds Base 91 Positive Scarfers by 2 points: Scarfed Rotoms and Scarfed Jolly Landorus Therian.
Hope it helped man!