Reuniclus: Since your team is super offensive, I'd suggest making Reuniclus more of a wall. Assault Vest over Life Orb and Regenerator over Magic Guard. Change Psychic to Psyshock to hit special walls and replace Recover for Knock Off to get rid of items on the opposing team, mainly Leftovers.
Reuniclus @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 240 SpA / 16 SpD
Quiet Nature
IVs: 0 Spe
- Shadow Ball
- Focus Blast
- Psyshock
- Knock Off
Flygon: Flygon doesn't want Rocky Helmet, especially considering the lack of recovery. Instead it can serve as a revenger with Choice Scarf. I'd suggest replacing Fire Punch with Outrage for extra power, and replace Defog/Iron Tail with U-turn for momentum and to get away from Fairy types until they are weakened.
Flygon @ Choice Scarf
Ability: Levitate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Outrage
- U-turn
- Dragon Claw
Chandelure: Chandelure doesn't need to focus on bulk with that raw base 145 special attack. Change Leftovers to Choice Specs and change the HP EVs to Speed EVs. Fire Blast over Flamethrower would be good, but if you are afraid of the miss chance, you can keep Flamethrower. Replace Dark Pulse with Trick to get rid of the Specs and annoy special walls.
Chandelure @ Choice Specs
Ability: Infiltrator
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fire Blast
- Shadow Ball
- Energy Ball
- Trick
Lucario: Brick Break/Drain Punch is too weak, even with Expert Belt. Change Expert Belt to Life Orb for more power. Change Brick Break/Drain Punch to Close Combat for more power. Change Rock Slide/Earthquake to Extreme Speed for stronger priority (Bullet Punch is weaker even factoring in STAB). Change Bullet Punch to Swords Dance to raise your attack to super high levels.
Lucario @ Life Orb
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Meteor Mash
- Extreme Speed
- Swords Dance
Roserade: You don't need to invest in bulk, or need Toxic Spikes at all. Toxic Spikes are super unreliable and once a poison type switches in, all the hard work of setting them up is gone. Spikes is much more reliable, because even one layer helps break down teams and it takes a bit more effort to remove Spikes. Spikes over Toxic Spikes, and choose Sludge Bomb over the two options to have dual STAB attacks. Change the EVs to 252 Special Attack, 252 Speed, and 4 Special Defense. Sleep Powder also helps setup Spikes, but you can keep Synthesis if you like it.
Roserade @ Black Sludge
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Giga Drain
- Spikes
- Sleep Powder
- Sludge Bomb
Ribombee: Ribombee simply does not sweep on its own. It needs setup in the form of Quiver Dance. Replace Leftovers with Focus Sash to get off a Quiver Dance safely. Replace Bug Buzz and use Quiver Dance, and replace Defog/Roost with Sticky Web to setup even more hazards.
Ribombee @ Focus Sash
Ability: Shield Dust
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Moonblast
- Psychic
- Sticky Web
- Quiver Dance
Hope this helped!
Full PokePaste Team