Staraptor should use Life Orb, Choice Band or Choice Scarf as its item to increase its power or speed, respectively.
I wouldn't use Torterra if I were you. There are better Grass Pokemon to use out there, like Trevenant, Gourgeist, Ferrothorn and Mega Venusaur. Rototiller is situational; it may benefit your opponent's Grass Pokemon. Life Orb and low Speed are bad combinations because Torterra will find itself KOed more easily:
Trevenant:
-Horn Leech/Wood Hammer
-Earthquake/Rock Slide
-Will-o-Wisp
-Rest
Nature: Impish
EVs: 252 HP/180 Def/76 Spe
Item: Leftovers/Lum Berry
Ability: Natural Cure/Harvest
or
-Horn Leech
-Shadow Claw/Leech Seed
-Will-o-Wisp
-Protect
Nature: Careful
EVs: 244 HP/16 Def/248 SDef
Item: Sitrus Berry
Ability: Harvest
or
-Substitute
-Leech Seed
-Will-o-Wisp
-Phantom Force
Nature: Impish
EVs: 252 HP/180 Def/76 Spe
Item: Sitrus Berry
Ability: Harvest
Gourgeist:
-Will-o-Wisp
-Leech Seed
-Seed Bomb
-Shadow Sneak/Protect
Nature: Impish
EVs: 252 HP/4 Atk/252 Def
Item: Leftovers
Ability: Frisk
Ferrothorn:
-Stealth Rock/Spikes
-Leech Seed
-Gyro Ball/Thunder Wave
-Power Whip/Protect
Nature: Relaxed
EVs: 252 HP/208 Def/48 SDef
Item: Leftovers/Shed Shell
Ability: Iron Barbs
Mega Venusaur:
-Giga Drain
-Sludge Bomb
-Earthquake/Leech Seed
-Synthesis
Nature: Relaxed/Bold
EVs: 252 HP/88 Def/168 SDef or 252 HP/252 Def/4 SDef
Item: Venusaurite
or
-Giga Drain/Leech Seed
-Sludge Bomb
-Hidden Power (Fire)
-Synthesis
Nature: Modest
EVs: 252 HP/4 Def/252 SAtk
Item: Venusaurite
I don't know how effective Porygon-Z is right now, tbh.
Fell Stinger is incredibly situational and requires the opponent to be KOed by it for Escavalier to get the +2 Attack. Unfortunately, it's rather weak. If I were you, I'd make Escavalier an Assault Vester because of its good Special bulk with the item:
-Megahorn
-Iron Head
-Drill Run
-Pursuit/Knock Off
Nature: Adamant/Brave
EVs: 248 HP/252 Atk/8 SDef
Item: Assault Vest
The lack of STAB hurts on Goodra, you know:
-Draco Meteor
-Fire Blast
-Sludge Bomb/Thunderbolt
-Focus Blast/Dragon Tail
Nature: Modest/Quiet/Sassy
EVs: 248 HP/252 SAtk/8 SDef
Item: Choice Specs/Assault Vest
Ability: Gooey/Sap Sipper
or
-Dragon Pulse
-Flamethrower
-Thunderbolt
-Toxic/Dragon Tail
Nature: Calm/Sassy
EVs: 248 HP/8 Def/252 SDef
Item: Leftovers
Ability: Gooey/Sap Sipper
Typhlosion is seriously mediocre in the standard environment. Why are you not taking advantage of Choice Scarf + Eruption? That's one of its biggest draws. Outside of this, Typhlosion is mediocre. Heatran, Charizard (either Mega Evolution) or Talonflame are better alternatives:
Heatran:
-Stealth Rock
-Lava Plume
-Toxic
-Earth Power/Roar
Nature: Calm
EVs: 248 HP/252 SDef/8 Spe
Item: Leftovers
Ability: Flash Fire
or
-Fire Blast
-Flash Cannon/Hidden Power (Ice)
-Earth Power
-Stealth Rock/Taunt/Toxic/Flame Charge
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Air Balloon
or
-Overheat/Fire Blast
-Earth Power
-Hidden Power (Ice/Grass)/Flash Cannon/Dragon Pulse
-Flamethrower/Hidden Power (Grass)
Nature: Modest/Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs/Choice Scarf
Charizard X:
-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
Charizardite Y:
-Fire Blast
-Solar Beam
-Focus Blast/Dragon Pulse
-Roost/Earthquake
Nature: Timid/Modest/Mild/Hasty
EVs: 4 Def/252 SAtk/252 Spe
Item: Charizardite Y
Talonflame:
-Swords Dance
-Flare Blitz
-Brave Bird
-Roost
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Sharp Beak/Sky Plate
Ability: Gale Wings
or
-Flare Blitz
-Brave Bird
-U-turn
-Will-o-Wisp/Tailwind
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band
Ability: Gale Wings
Note that you have some Pokemon weak to Stealth Rock; a Rapid Spinner may be necessary:
Tentacruel:
-Scald
-Sludge Bomb
-Rapid Spin
-Knock Off/Toxic
Nature: Bold
EVs: 252 HP/224 Def/32 Spe
Item: Black Sludge
Ability: Liquid Ooze
Excadrill:
-Earthquake
-Rock Slide/Iron Head
-Rapid Spin
-Swords Dance/Stealth Rock
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Air Balloon/Chople Berry
Ability: Mold Breaker
Starmie:
-Hydro Pump/Surf
-Thunderbolt/Psyshock
-Ice Beam
-Rapid Spin
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Leftovers/Life Orb
Ability: Natural Cure
or
-Scald
-Rapid Spin
-Psyshock/Ice Beam/Thunderbolt
-Recover
Nature: Timid
EVs: 248 HP/32 Def/4 SAtk/224 Spe
Item: Leftovers
Ability: Natural Cure
Blastoise:
-Water Pulse/Scald/Hydro Pump
-Dark Pulse
-Aura Sphere/Ice Beam
-Rapid Spin
Nature: Modest
EVs: 252 HP/252 SAtk/4 SDef
Item: Blastoisinite
Crobat:
-Brave Bird
-Roost
-Defog
-Taunt/Toxic
Nature: Jolly
EVs: 168 HP/136 Atk/4 SDef/200 Spe
Item: Black Sludge
Ability: Infiltrator
Mandibuzz:
-Foul Play
-Roost
-Taunt/Whirlwind
-Defog/Toxic/Knock Off
Nature: Bold/Impish
EVs: 248 HP/216 Def/44 SDef
Item: Leftovers
Ability: Overcoat
You'll have to figure out who to replace to accommodate for Rapid Spin/Defog support.
