Espeon is walled badly by Dark Pokemon, atm, so I'd have Hidden Power Fire or Dazzling Gleam as its coverage option.
Defensive Ninetales should look like this, as it's outclassed in offensive roles by Charizard Y:
-Rest
-Sleep Talk
-Flamethrower
-Will-o-Wisp
Nature: Calm
EVs: 248 HP/140 SDef/120 Spe
Item: Heat Rock
Ability: Drought
Pokemon that benefit from the sun that Ninetales brings are ideal, like Venusaur, Charizard (both Megas), Mega Houndoom and Volcarona are appreciated:
Venusaur:
-Sunny Day/Growth
-Giga Drain/Energy Ball
-Sludge Bomb
-Hidden Power (Fire)/Sleep Powder/Earthquake
Nature: Modest/Rash
EVs: 24 HP/252 SAtk/232 Spe
Item: Heat Rock/Life Orb
Ability: Chlorophyll
Charizard:
-Dragon Dance
-Flare Blitz
-Dragon Claw/Outrage
-Earthquake/Roost
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Charizardite X
Ability: Blaze
or
-Fire Punch
-Dragon Claw
-Will-o-Wisp
-Roost
Nature: Jolly
EVs: 248 HP/84 SDef/176 Spe
Item: Charizardite X
Ability: Blaze
or
-Fire Blast
-Solar Beam
-Focus Blast/Dragon Pulse
-Earthquake/Roost
Nature: Mild/Hasty/Modest/Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Charizardite Y
Mega Houndoom:
-Fire Blast
-Solar Beam/Hidden Power (Fighting/Ground)
-Dark Pulse/Destiny Bond
-Sunny Day/Destiny Bond
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Houndoominite
Ability: Flash Fire
Volcarona:
-Quiver Dance
-Fire Blast/Fiery Dance
-Bug Buzz
-Hidden Power (Rock/Ground)/Giga Drain/Psychic
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Lum Berry
Ability: Flame Body
or
-Quiver Dance
-Fiery Dance
-Bug Buzz
-Roost
Nature: Timid
EVs: 240 HP/252 Def/16 Spe
Item: Leftovers
Ability: Flame Body
That's all I have for now.