Elite Four

The first Elite Four member is Aaron who wishes to show the Bug-type Pokémon his true strengths

Elite Four Aaron	Dustox	Beautifly	Vespiquen	Heracross	Drapion
Battle Type Items	Level 53	Level 53	Level 54	Level 54	Level 57
	Shield Dust	Swarm	Unnerve	Guts	Sniper
	Attacks: Toxic Bug Buzz Moonlight Light Screen	Attacks: Bug Buzz Shadow Ball Psychic Quiver Dance	Attacks: Acrobatics Attack Order Aerial Ace Defend Order	Attacks: Earthquake Rock Slide Facade Brick Break	Attacks: Cross Poison Night Slash Earthquake X-Scissor
	Hold Item: Black Sludge	Hold Item: Wise Glasses	Hold Item: Sitrus Berry	Hold Item: Flame Orb	Hold Item: Scope Lens
	Nature: Bold	Nature: Modest	Nature: Adamant	Nature: Jolly	Nature: Jolly

The second Elite Four member is the Ground-type focused Bertha who wants to see a tough battle

Elite Four Bertha	Quagsire	Sudowoodo	Golem	Whiscash	Hippowdon
Battle Type Items	Level 55	Level 56	Level 56	Level 55	Level 59
	Water Absorb	Rock Head	Sturdy	Hydration	Sand Stream
	Attacks: Recover Toxic Earthquake Surf	Attacks: Double-Edge Head Smash Sucker Punch Low Kick	Attacks: Rock Polish Heavy Slam Earthquake Stone Edge	Attacks: Bulldoze Ice Beam Belch Hydro Pump	Attacks: Ice Fang Earthquake Crunch Rest
	Hold Item: Leftovers	Hold Item: Sitrus Berry	Hold Item: Soft Sand	Hold Item: Rindo Berry	Hold Item: Chesto Berry
	Nature: Impish	Nature: Adamant	Nature: Jolly	Nature: Modest	Nature: Adamant

The third Elite Four member is the Fire-type move focused Flint. While he doesn't use many Fire-type Pokémon here, he uses the Fire-type moves in his strategies

Elite Four Flint	Rapidash	Steelix	Drifblim	Lopunny	Infernape
Battle Type Items	Level 58	Level 57	Level 58	Level 57	Level 61
	Flame Body	Sheer Force	Unburden	Cute Charm	Iron Fist
	Attacks: Flame Charge Iron Tail Poison Jab Hypnosis	Attacks: Thunder Fang Fire Fang Iron Tail Crunch	Attacks: Strength Sap Minimize Baton Pass Will-O-Wisp	Attacks: Mirror Coat High Jump Kick Quick Attack Fire Punch	Attacks: Fire Punch Thunder Punch Close Combat Mach Punch
	Hold Item: Wide Lens	Hold Item: Life Orb	Hold Item: Sitrus Berry	Hold Item: Leftovers	Hold Item: Focus Sash
	Nature: Jolly	Nature: Adamant	Nature: Timid	Nature: Jolly	Nature: Jolly

The final member of the Elite Four is the Psychic-type focused Lucian who is impressed by how far you have come

Elite Four Lucian	Mr. Mime	Girafarig	Medicham	Alakazam	Bronzong
Battle Type Items	Level 59	Level 59	Level 60	Level 60	Level 63
	Filter	Sap Sipper	Pure Power	Magic Guard	Levitate
	Attacks: Light Screen Reflect Psychic Dazzling Gleam	Attacks: Light Screen Psychic Thunderbolt Trick Room	Attacks: Zen Headbutt High Jump Kick Thunder Punch Ice Punch	Attacks: Nasty Plot Psychic Future Sight Shock Wave	Attacks: Gyro Ball Earthquake Payback Trick Room
	Hold Item: Light Clay	Hold Item: Mental Herb	Hold Item: Muscle Band	Hold Item: Life Orb	Hold Item: Sitrus Berry
	Nature: Bold	Nature: Calm	Nature: Brave	Nature: Timid	Nature: Brave

The Champion of the region is Cynthia, the trainer you encountered several times through your journey through Sinnoh. Her team has no major focus and is designed to withstand and dish out a lot of damage

Champion Cynthia	Spiritomb	Roserade	Gastrodon	Lucario	Milotic	Garchomp
Battle Type Items	Level 61	Level 60	Level 60	Level 63	Level 63	Level 66
	Pressure	Poison Point	Storm Drain	Inner Focus	Marvel Scale	Rough Skin
	Attacks: Shadow Ball Dark Pulse Psychic Sucker Punch	Attacks: Dazzling Gleam Shadow Ball Sludge Bomb Energy Ball	Attacks: Scald Earthquake Sludge Bomb Rock Tomb	Attacks: Aura Sphere Dragon Pulse Flash Cannon Nasty Plot	Attacks: Recover Mirror Coat Ice Beam Scald	Attacks: Dragon Claw Earthquake Swords Dance Poison Jab
	Hold Item: Sitrus Berry	Hold Item: Expert Belt	Hold Item: Leftovers	Hold Item: Wise Glasses	Hold Item: Flame Orb	Hold Item: Yache Berry
	Nature: Quiet	Nature: Timid	Nature: Relaxed	Nature: Timid	Nature: Bold	Nature: Jolly

Aaron is the Elite Four member who doesn't really shake his team up too much. He introduces Yanmega and Scizor while removing Beautifly and Dustox to give some harder damage inflicting power. In the stronger rematch, he also adds the Ground/Dragon-type Pokémon, Flygon

Elite Four Aaron	Yanmega	Scizor	Vespiquen	Heracross	Drapion
Battle Type Items	Level 65	Level 65	Level 66	Level 67	Level 69
	Speed Boost	Technician	Unnerve	Guts	Sniper
	Attacks: Bug Buzz Air Slash Detect Ancient Power	Attacks: Bullet Punch X-Scissor Night Slash Swords Dance	Attacks: Power Gem Attack Order Aerial Ace Defend Order	Attacks: Earthquake Rock Slide Facade Close Combat	Attacks: Cross Poison Night Slash Earthquake X-Scissor
	Hold Item: Wise Glasses	Hold Item: Occa Berry	Hold Item: Sitrus Berry	Hold Item: Flame Orb	Hold Item: Scope Lens
	Nature: Timid	Nature: Adamant	Nature: Adamant	Nature: Jolly	Nature: Jolly

Elite Four Aaron	Yanmega	Scizor	Vespiquen	Heracross	Flygon	Drapion
Battle Type Items	Level 75	Level 75	Level 77	Level 77	Level 75	Level 79
	Speed Boost	Technician	Unnerve	Guts	Levitate	Sniper
	Attacks: Bug Buzz Air Slash Detect Ancient Power	Attacks: Bullet Punch X-Scissor Night Slash Swords Dance	Attacks: Power Gem Attack Order Aerial Ace Defend Order	Attacks: Earthquake Rock Slide Facade Close Combat	Attacks: Dragon Pulse Earth Power Boomburst Bug Buzz	Attacks: Cross Poison Night Slash Earthquake X-Scissor
	Hold Item: Wise Glasses	Hold Item: Occa Berry	Hold Item: Sitrus Berry	Hold Item: Flame Orb	Hold Item: Wise Glasses	Hold Item: Scope Lens
	Nature: Timid	Nature: Adamant	Nature: Adamant	Nature: Jolly	Nature: Modest	Nature: Jolly

Bertha's team doesn't change that much, with Sudowoodo being replaced by Gliscor and Quagsire by Rhyperior. This team gets even touger with Mamoswine added, and Nidoking replacing Golem in the stronger match, bringing coverage to take out Grass-types and Water-types

Elite Four Bertha	Whiscash	Gliscor	Golem	Hippowdon	Rhyperior
Battle Type Items	Level 66	Level 69	Level 68	Level 68	Level 71
	Hydration	Hyper Cutter	Sturdy	Sand Stream	Solid Rock
	Attacks: Earthquake Ice Beam Scald Zen Headbutt	Attacks: Earthquake Thunder Fang Guillotine X-Scissor	Attacks: Rock Polish Heavy Slam Earthquake Stone Edge	Attacks: Ice Fang Earthquake Crunch Rest	Attacks: Earthquake Rock Wrecker Megahorn Thunder Fang
	Hold Item: Rindo Berry	Hold Item: Sitrus Berry	Hold Item: Soft Sand	Hold Item: Chesto Berry	Hold Item: Muscle Band
	Nature: Brave	Nature: Adamant	Nature: Jolly	Nature: Adamant	Nature: Adamant

Elite Four Bertha	Whiscash	Gliscor	Nidoking	Hippowdon	Mamoswine	Rhyperior
Battle Type Items	Level 76	Level 79	Level 78	Level 78	Level 78	Level 81
	Hydration	Hyper Cutter	Sheer Force	Sand Stream	Thick Fat	Solid Rock
	Attacks: Earthquake Ice Beam Scald Zen Headbutt	Attacks: Earthquake Thunder Fang Guillotine X-Scissor	Attacks: Sludge Bomb Earth Power Thunderbolt Ice Beam	Attacks: Ice Fang Earthquake Crunch Rest	Attacks: Earthquake Icicle Spear Ice Shard Double-Edge	Attacks: Earthquake Rock Wrecker Megahorn Thunder Fang
	Hold Item: Rindo Berry	Hold Item: Sitrus Berry	Hold Item: Life Orb	Hold Item: Chesto Berry	Hold Item: Never-Melt Ice	Hold Item: Muscle Band
	Nature: Brave	Nature: Adamant	Nature: Modest	Nature: Adamant	Nature: Adamant	Nature: Adamant

Flint's team went through a massive overhaul with the rematch, becoming a pure Fire-type team. It is further improved with Ninetales in the second rematch team

Elite Four Flint	Houndoom	Flareon	Rapidash	Infernape	Magmortar
Battle Type Items	Level 68	Level 71	Level 69	Level 71	Level 73
	Unnerve	Flash Fire	Flame Body	Iron Fist	Flame Body
	Attacks: Flamethrower Dark Pulse Destiny Bond Nasty Plot	Attacks: Flare Blitz Flail Will-O-Wisp Quick Attack	Attacks: Flare Blitz Iron Tail Poison Jab Hypnosis	Attacks: Fire Punch Thunder Punch Close Combat Mach Punch	Attacks: Fire Blast Thunderbolt Focus Blast Psychic
	Hold Item: Wise Glasses	Hold Item: Sitrus Berry	Hold Item: Wide Lens	Hold Item: Focus Sash	Hold Item: Lum Berry
	Nature: Modest	Nature: Adamant	Nature: Jolly	Nature: Jolly	Nature: Modest

Elite Four Flint	Ninetales	Houndoom	Rapidash	Infernape	Arcanine	Magmortar
Battle Type Items	Level 78	Level 78	Level 79	Level 81	Level 81	Level 83
	Drought	Unnerve	Flame Body	Iron Fist	Intimidate	Flame Body
	Attacks: Flamethrower Solar Beam Hypnosis Nasty Plot	Attacks: Flamethrower Dark Pulse Destiny Bond Nasty Plot	Attacks: Flare Blitz Iron Tail Poison Jab Hypnosis	Attacks: Fire Punch Thunder Punch Close Combat Mach Punch	Attacks: Flare Blitz Play Rough Close Combat Extreme Speed	Attacks: Fire Blast Thunderbolt Focus Blast Psychic
	Hold Item: Heat Rock	Hold Item: Wise Glasses	Hold Item: Wide Lens	Hold Item: Focus Sash	Hold Item: Shuca Berry	Hold Item: Sitrus Berry
	Nature: Timid	Nature: Modest	Nature: Jolly	Nature: Jolly	Nature: Jolly	Nature: Modest

Lucian's team gets some more National Pokédex focused PSychic-type Pokémon in the rematches, designed to counter various weaknesses.

Elite Four Lucian	Mr. Mime	Espeon	Bronzong	Alakazam	Gallade
Battle Type Items	Level 69	Level 71	Level 70	Level 72	Level 75
	Filter	Magic Bounce	Levitate	Magic Guard	Justified
	Attacks: Light Screen Reflect Psychic Dazzling Gleam	Attacks: Psychic Dazzling Gleam Shadow Ball Light Screen	Attacks: Gyro Ball Earthquake Payback Rock Slide	Attacks: Nasty Plot Psychic Dazzling Gleam Shock Wave	Attacks: Close Combat Psycho Cut Poison Jab Shadow Sneak
	Hold Item: Light Clay	Hold Item: Mental Herb	Hold Item: Muscle Band	Hold Item: Life Orb	Hold Item: Sitrus Berry
	Nature: Bold	Nature: Timid	Nature: Brave	Nature: Timid	Nature: Jolly

Elite Four Lucaian	Mr. Mime	Espeon	Bronzong	Alakazam	Slowbro	Gallade
Battle Type Items	Level 79	Level 81	Level 80	Level 82	Level 82	Level 85
	Filter	Magic Bounce	Levitate	Magic Guard	Regenerator	Justified
	Attacks: Light Screen Reflect Psychic Dazzling Gleam	Attacks: Psychic Dazzling Gleam Shadow Ball Light Screen	Attacks: Gyro Ball Earthquake Payback Rock Slide	Attacks: Nasty Plot Psychic Dazzling Gleam Shock Wave	Attacks: Scald Psychic Flamethrower Slack Off	Attacks: Close Combat Psycho Cut Poison Jab Shadow Sneak
	Hold Item: Light Clay	Hold Item: Mental Herb	Hold Item: Muscle Band	Hold Item: Life Orb	Hold Item: Leftovers	Hold Item: Sitrus Berry
	Nature: Bold	Nature: Timid	Nature: Brave	Nature: Timid	Nature: Bold	Nature: Jolly

Cynthia's team doesn't change much in the rematch, with various similar strategies being taken. Gastrodon is first replaced by Togekiss, and then Roserade by Porygon-Z in order to create a massively powerful team that can cover pretty much any team.

Champion Cynthia	Spiritomb	Roserade	Togekiss	Lucario	Milotic	Garchomp
Battle Type Items	Level 74	Level 74	Level 76	Level 76	Level 74	Level 78
	Pressure	Poison Point	Serene Grace	Inner Focus	Marvel Scale	Rough Skin
	Attacks: Shadow Ball Dark Pulse Will-O-Wisp Sucker Punch	Attacks: Dazzling Gleam Shadow Ball Sludge Bomb Energy Ball	Attacks: Air Slash Dazzling Gleam Aura Sphere Thunder Wave	Attacks: Aura Sphere Dragon Pulse Flash Cannon Psychic	Attacks: Recover Mirror Coat Ice Beam Scald	Attacks: Dragon Claw Earthquake Swords Dance Poison Jab
	Hold Item: Sitrus Berry	Hold Item: Expert Belt	Hold Item: Leftovers	Hold Item: Wise Glasses	Hold Item: Flame Orb	Hold Item: Yache Berry
	Nature: Quiet	Nature: Timid	Nature: Timid	Nature: Timid	Nature: Bold	Nature: Jolly

Champion Cynthia	Spiritomb	Porygon-Z	Togekiss	Lucario	Milotic	Garchomp
Battle Type Items	Level 84	Level 85	Level 86	Level 86	Level 84	Level 88
	Pressure	Adaptability	Serene Grace	Inner Focus	Marvel Scale	Rough Skin
	Attacks: Shadow Ball Dark Pulse Will-O-Wisp Sucker Punch	Attacks: Hyper Beam Shadow Ball Ice Beam Thunderbolt	Attacks: Air Slash Dazzling Gleam Aura Sphere Thunder Wave	Attacks: Close Combat Meteor Mash Earthquake Extreme Speed	Attacks: Recover Mirror Coat Ice Beam Scald	Attacks: Dragon Claw Earthquake Swords Dance Poison Jab
	Hold Item: Sitrus Berry	Hold Item: Expert Belt	Hold Item: Leftovers	Hold Item: Focus Sash	Hold Item: Flame Orb	Hold Item: Yache Berry
	Nature: Quiet	Nature: Timid	Nature: Timid	Nature: Jolly	Nature: Bold	Nature: Jolly