[RATE MY TEAM] Mega Venusaur Team

[cfencl]

Hi
 
I want to build the best competitive team possible centered around some of my favorite Pokémon. My favorite Pokémon of all time is Venusaur. Please help me out. Here is some info to help understand what I’m going for. I am open to any suggestions/changes, this is just what I’ve come up with so far. I have no clear strategy I want to use or style I want to play except the best possible one with my favorite Pokémon.
 

1. Venusaur-Mega= Holding Venusaurite
   
   1. Nature= Modest
      
   2. Giga Drain
      
   3. Sludge bomb
      
   4. Leech seed
      
   5. Synthesis
      
2. Garchomp= Holding Rocky Helmet
   
   1. Nature= Jolly
      
   2. Earthquake
      
   3. Dragon Rush
      
   4. Rock Slide
      
   5. ?
      
3. Greninja= Holding Life Orb
   
   1. Nature= Timid
      
   2. Scald
      
   3. Ice beam
      
   4. Dark pulse
      
   5. U turn
      
4. Arcanine= Holding ?
   
   1. Nature= Adamant
      
   2. Flare blitz
      
   3. Wild charge
      
   4. Extreme speed
      
   5. Roar
      
5. Sylveon= Holding Leftovers
   
   1. Nature= Bold
      
   2. Dazzling gleam
      
   3. Protect
      
   4. ?
      
   5. ?
      
6. ? I was think about Heracross, Lucario, Skarmory or Crobat here but I’m not sure.