Tyrantrum is outclassed in standard play because of its common weaknesses. Tyranitar can do whatever Tyrantrum can do better:
-Stone Edge
-Crunch
-Pursuit
-Earthquake/Ice Punch
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe (Jolly) or 180 HP/252 Atk/76 Spe (Adamant)
Item: Choice Scarf (Jolly)/Choice Band (Adamant)
Ability: Sand Stream
or
-Crunch
-Stone Edge/Ice Beam
-Earthquake
-Stealth Rock/Fire Blast
Nature: Impish/Relaxed
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Sand Stream
Lucario is best played as either of these:
-Swords Dance
-Close Combat
-Extreme Speed
-Iron Tail/Ice Punch/Earthquake
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb
or
-Close Combat
-Iron Tail
-Bullet Punch
-Stone Edge/Ice Punch/Swords Dance
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lucarionite
or
-Nasty Plot
-Aura Sphere
-Flash Cannon
-Dark Pulse/Shadow Ball/Vacuum Wave
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Lucarionite
Ability: Steadfast/Inner Focus
Chesnaught is only good with its DW/Hidden ability, Bulletproof:
-Leech Seed
-Spiky Shield
-Hammer Arm/Seed Bomb
-Synthesis/Roar
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Bulletproof
or
-Spikes
-Roar
-Hammer Arm/Seed Bomb
-Synthesis
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Bulletproof
Blastoise is only good in its Mega form, tbh:
-Water Pulse/Scald/Hydro Pump
-Dark Pulse
-Aura Sphere/Ice Beam
-Rapid Spin
Nature: Modest
EVs: 252 HP/252 SAtk/4 SDef
Item: Blastoisinite
Scizor is best played as a sweeper or revenge killer:
-Swords Dance
-Bullet Punch
-Bug Bite/X-Scissor/Knock Off
-Roost
Nature: Adamant
EVs: 248 HP/40 Atk/220 SDef
Item: Leftovers
Ability: Technician
or
-Swords Dance
-Bullet Punch
-Bug Bite/X-Scissor/U-turn
-Knock Off/Superpower
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb/Leftovers
Ability: Technician
or
-U-turn
-Bullet Punch
-Superpower
-Pursuit/Knock Off
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Ability: Technician
Snorlax is one of the best Assault Vest users out there:
-Return/Body Slam
-Earthquake
-Fire Punch/Crunch
-Self-Destruct/Pursuit/Wild Charge
Nature: Adamant
EVs: 252 Atk/252 SDef/4 Spe
Item: Assault Vest
Ability: Thick Fat