Just saying, Mega Venusaur has a wide support move pool, but it can't fit all of them at once. This is the best way to take advantage of its support capabilities. Mega Venusaur also threatens Fairies greatly, and Sludge Bomb chunks them for super effective damage; you also lack that move:
-Giga Drain
-Sludge Bomb
-Sleep Powder/Leech Seed/Hidden Power (Fire)/Earthquake
-Synthesis
Nature: Bold/Relaxed
EVs: 252 HP/240 Def/16 Spe
Item: Venusaurite
Rhyperior is miles better than Eviolite Rhydon because it can hold Leftovers. It also has Solid Rock to cushion its common weaknesses. Those aspects outweigh Rhydon's Eviolite-boosted bulk, as Rhydon gets worn down faster than Rhyperior, due to the lack of Leftovers recovery:
-Stealth Rock
-Earthquake
-Stone Edge/Rock Blast
-Toxic/Ice Punch
Nature: Adamant
EVs: 212 HP/44 Atk/252 Def
Item: Leftovers
Ability: Solid Rock
Roost is a more reliable recovery option on Togekiss. There are better Wish users out there:
-Thunder Wave
-Air Slash
-Heal Bell/Defog/Dazzling Gleam/Aura Sphere/Flamethrower
-Roost
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Serene Grace
A good Wish user to put here is Clefable:
-Wish
-Protect
-Moonblast
-Heal Bell/Aromatherapy/Thunder Wave
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Unaware/Magic Guard
Hydro Pump lets Kingdra hit Fairies hard enough already, so it's unnecessary. Agility is preferred in the last slot to act as a "double-dancer" of sorts. Focus Energy lets Kingdra wreck defensive teams; Agility helps it clean up offensive ones. Don't try to set up both boosts at once, but you
could do that if you get lucky.
Offtopic: Volcarona = Strong looking female!? wat
Volcarona looks feminine to some people.