Approved by Treecko and Joim
Look at the official XY type matchup chart here. Below you'll see the same order of the 18 types of Pokemon and a sequence of arrows. Choose a type, say, Poison. Follow the arrow and from now on, all Pokemon with the Poison type shift into Fighting.
But it doesn't end there. Not everything has a deep enough movepool to take advantage of this change, leaving a select group of versatile Pokemon to dominate, like Arcanine for example. However, if you take all the corresponding moves and shift those as well, an entire new metagame comes out of it.
As Treecko said when I presented the proposal:
Offensively, we get stuff like Ghost/Ground Dragonite and Salamence, Fighting/Poison Nidoking, Rock/Fighting Gengar, Dragon/Dark Bisharp, and Dragon/Ice Scrafty and more and more.
Defensively, we get stuff like Steel Clefable, Normal Torkoal, Flying Espeon, Electric Regice, Water/Fighting Amoonguss, Ghost Goodra, Fire/Steel Azumarill and on and on.
Nerfs include Bug/Ice Terrakion, Psychic/Dark Scizor, Normal/Ice Blaziken (or are they...?)
The rest.
Stealth Bug (formally known as Stealth Rock)
Now that Stealth Rock's bane on battling has lifted, it's replaced by a new type that hurts Grass, Psychic, and Dark Pokemon. Formally solid OU Pokemon like Scizor (x4), Magnezone (x4), Skarmory (x2), Aegislash (x2), Ferrothorn (x2), and Forretress (x4) will want Rapid Spin and Defog support to comfortably switch in. The types that feared Rock before, like Fire, Flying, Bug, and Ice (and any combination between them), can now switch with little worry. And also take note of the types that resist Bug: Fighting, Fairy, Steel, Fire, Flying, Ghost, and Poison. Starmie, a Fire/Flying type, Claydol, a Poison/Flying type, and Tentacruel, a Fire/Fighting type, all quad resist it and have access to Rapid Spin. What a deal!
Will-o-Wisp, Thunder Wave, Toxic, Spore, etc (Status in general)
The status moves still work very much the same, and according to the notes on the type chart linked above, Fire-types can't be burned, Electric-types can't be paralyzed, Poison- and Steel-types can't be poisoned, Grass-types are immune to Leech Seed (even though it's a Water move), powder, and spore moves, Ice-types can't be frozen, and Ground-types are still immune to Thunder Wave (even though it's a Grass move.)
Will-o-Wisp and Toxic still hit Ghosts-types even though they're Normal and Fighting moves respectively. Ghosts are only immune to Normal and Fighting attacks, not status.
Spikes and Toxic Spikes
Don't let this mess with you too much, but Spikes are now Poison and they function the same as always, except they don't affect Steel-types now. They are not absorbed by other Poison-types.
Toxic Spikes is a Fighting-type move that is absorbed by Poison-types and still poisons foes like before. Steel-types are still immune.
Swellow – Fairy/Ground
Guts / Scrappy
60/85/60/50/50/125
Facade, Brave Bird, Quick Attack, U-turn, Protect
Why?: Swellow now resists Stealth Bug, making its Guts set deadlier since it won't take as much damage switching in. Fairy+Ground gives great coverage together and U-turn lets it switch out against Non-Grounded Steel- and Poison-types (and will hit the Poison-types super effectively.)
Torkoal - Normal
White Smoke / Shell Armor
70/85/140/85/70/20
Stealth Rock, Will-o-Wisp, Body Slam, Rapid Spin, Lava Plume, Clear Smog
MOAR coming soon, including a decision on Ubers/banlists. To get started, Sleep, OHKO, Species, Evasion, Moody cluases are in effect








































But it doesn't end there. Not everything has a deep enough movepool to take advantage of this change, leaving a select group of versatile Pokemon to dominate, like Arcanine for example. However, if you take all the corresponding moves and shift those as well, an entire new metagame comes out of it.
As Treecko said when I presented the proposal:
Treecko said:Thoughts on changing the typing of moves as well? This way, almost everything gets decent STAB, and the stuff that didn't probably sucks ass anyways. The only problem here would be remembering what coverage moves certain Pokemon have and what type those coverage moves would become. Take your example of Arcanine (because it gets some cool coverage moves). Normally, it runs something along the lines of Flare Blitz, Extreme Speed, Wild Charge, and Close Combat, but with shifted typings on those coverage moves, it would have: Normal-type Flare Blitz, Fairy-type Extreme Speed (which would actually be pretty amazing), Grass-type Wild Charge, and Ice-type Close Combat (:O). This coverage is extremely (totally) different from what it normally has
Offensively, we get stuff like Ghost/Ground Dragonite and Salamence, Fighting/Poison Nidoking, Rock/Fighting Gengar, Dragon/Dark Bisharp, and Dragon/Ice Scrafty and more and more.
Defensively, we get stuff like Steel Clefable, Normal Torkoal, Flying Espeon, Electric Regice, Water/Fighting Amoonguss, Ghost Goodra, Fire/Steel Azumarill and on and on.
Nerfs include Bug/Ice Terrakion, Psychic/Dark Scizor, Normal/Ice Blaziken (or are they...?)
The rest.
And
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Stealth Bug (formally known as Stealth Rock)
Now that Stealth Rock's bane on battling has lifted, it's replaced by a new type that hurts Grass, Psychic, and Dark Pokemon. Formally solid OU Pokemon like Scizor (x4), Magnezone (x4), Skarmory (x2), Aegislash (x2), Ferrothorn (x2), and Forretress (x4) will want Rapid Spin and Defog support to comfortably switch in. The types that feared Rock before, like Fire, Flying, Bug, and Ice (and any combination between them), can now switch with little worry. And also take note of the types that resist Bug: Fighting, Fairy, Steel, Fire, Flying, Ghost, and Poison. Starmie, a Fire/Flying type, Claydol, a Poison/Flying type, and Tentacruel, a Fire/Fighting type, all quad resist it and have access to Rapid Spin. What a deal!
Will-o-Wisp, Thunder Wave, Toxic, Spore, etc (Status in general)
The status moves still work very much the same, and according to the notes on the type chart linked above, Fire-types can't be burned, Electric-types can't be paralyzed, Poison- and Steel-types can't be poisoned, Grass-types are immune to Leech Seed (even though it's a Water move), powder, and spore moves, Ice-types can't be frozen, and Ground-types are still immune to Thunder Wave (even though it's a Grass move.)
Will-o-Wisp and Toxic still hit Ghosts-types even though they're Normal and Fighting moves respectively. Ghosts are only immune to Normal and Fighting attacks, not status.
Spikes and Toxic Spikes
Don't let this mess with you too much, but Spikes are now Poison and they function the same as always, except they don't affect Steel-types now. They are not absorbed by other Poison-types.
Toxic Spikes is a Fighting-type move that is absorbed by Poison-types and still poisons foes like before. Steel-types are still immune.

Swellow – Fairy/Ground
Guts / Scrappy
60/85/60/50/50/125
Facade, Brave Bird, Quick Attack, U-turn, Protect
Why?: Swellow now resists Stealth Bug, making its Guts set deadlier since it won't take as much damage switching in. Fairy+Ground gives great coverage together and U-turn lets it switch out against Non-Grounded Steel- and Poison-types (and will hit the Poison-types super effectively.)

Torkoal - Normal
White Smoke / Shell Armor
70/85/140/85/70/20
Stealth Rock, Will-o-Wisp, Body Slam, Rapid Spin, Lava Plume, Clear Smog
Fairy
Explosion – 250
Self-Destruct – 200
Boomburst – 140
Return/Frustration – 102
Hyper Voice – 90
Body Slam – 85
Extreme Speed – 80
Tri Attack – 80
Facade – 70
Fake Out – 40
Quick Attack – 40
Rapid Spin – 20
Normal
Flare Blitz – 120
Fire Blast – 110
Heat Wave – 95
Flamethrower – 90
Lava Plume – 80
Fire Punch – 75
Will-o-wisp
Fire
Hydro Pump – 110
Aqua Tail – 90
Surf – 90
Scald – 80
Waterfall – 80
Aqua Jet – 40
Water
Power Whip – 120
Energy Ball – 90
Leaf Blade – 90
Seed Bomb – 80
Giga Drain – 75
Bullet Seed – 25
Grass Knot
Leech Seed
Spore
Sleep Powder
Grass
Fusion Bolt – 100
Thunderbolt – 90
Wild Charge – 90
Discharge – 80
Thunder Punch – 75
Volt Switch – 70
Thunder Wave
Electric
Ice Beam – 90
Icicle Crash – 85
Ice Punch – 75
Ice Shard – 40
Icicle Spear – 25
Ice
Close Combat – 120
Focus Blast – 120
Superpower – 120
Jump Kick – 100
Aura Sphere – 80
Drain Punch – 75
Mach Punch – 40
Seismic Toss
Fighting
Gunk Shot – 120
Sludge Wave – 95
Sludge Bomb – 90
Poison Jab – 80
Clear Smog – 50
Toxic
Toxic Spikes
Poison
Earthquake – 100
Earth Power – 90
Spikes
Ground
Brave Bird – 120
Hurricane – 110
Air Slash – 75
Acrobatics – 55
Defog
Roost
Flying
Psychic – 90
Psyshock – 80
Zen Headbutt – 80
Psycho Cut – 70
Psychic
Megahorn – 120
Bug Buzz – 90
X-scissor – 80
Signal Beam – 75
U-turn – 70
Pin Missile – 25
Sticky Web
Bug
Head Smash – 150
Stone Edge – 100
Power Gem – 80
Rock Slide – 75
Rock Blast – 25
Stealth Rock
Rock
Shadow Ball – 80
Shadow Claw – 70
Shadow Sneak – 40
Night Shade
Destiny Bond
Ghost
Draco Meteor – 130
Outrage – 120
Spacial Rend – 100
Dragon Pulse – 85
Dragon Claw – 80
Dragon Tail – 60
Dragon
Foul Play – 95
Crunch – 80
Dark Pulse – 80
Sucker Punch – 80
Night Slash – 70
Knock Off – 65
Pursuit – 40
Dark
Flash Cannon – 80
Iron Head – 80
Bullet Punch – 40
Gyro Ball
Steel
Moonblast – 95
Play Rough – 90
Dazzling Gleam – 80
Explosion – 250
Self-Destruct – 200
Boomburst – 140
Return/Frustration – 102
Hyper Voice – 90
Body Slam – 85
Extreme Speed – 80
Tri Attack – 80
Facade – 70
Fake Out – 40
Quick Attack – 40
Rapid Spin – 20
Normal
Flare Blitz – 120
Fire Blast – 110
Heat Wave – 95
Flamethrower – 90
Lava Plume – 80
Fire Punch – 75
Will-o-wisp
Fire
Hydro Pump – 110
Aqua Tail – 90
Surf – 90
Scald – 80
Waterfall – 80
Aqua Jet – 40
Water
Power Whip – 120
Energy Ball – 90
Leaf Blade – 90
Seed Bomb – 80
Giga Drain – 75
Bullet Seed – 25
Grass Knot
Leech Seed
Spore
Sleep Powder
Grass
Fusion Bolt – 100
Thunderbolt – 90
Wild Charge – 90
Discharge – 80
Thunder Punch – 75
Volt Switch – 70
Thunder Wave
Electric
Ice Beam – 90
Icicle Crash – 85
Ice Punch – 75
Ice Shard – 40
Icicle Spear – 25
Ice
Close Combat – 120
Focus Blast – 120
Superpower – 120
Jump Kick – 100
Aura Sphere – 80
Drain Punch – 75
Mach Punch – 40
Seismic Toss
Fighting
Gunk Shot – 120
Sludge Wave – 95
Sludge Bomb – 90
Poison Jab – 80
Clear Smog – 50
Toxic
Toxic Spikes
Poison
Earthquake – 100
Earth Power – 90
Spikes
Ground
Brave Bird – 120
Hurricane – 110
Air Slash – 75
Acrobatics – 55
Defog
Roost
Flying
Psychic – 90
Psyshock – 80
Zen Headbutt – 80
Psycho Cut – 70
Psychic
Megahorn – 120
Bug Buzz – 90
X-scissor – 80
Signal Beam – 75
U-turn – 70
Pin Missile – 25
Sticky Web
Bug
Head Smash – 150
Stone Edge – 100
Power Gem – 80
Rock Slide – 75
Rock Blast – 25
Stealth Rock
Rock
Shadow Ball – 80
Shadow Claw – 70
Shadow Sneak – 40
Night Shade
Destiny Bond
Ghost
Draco Meteor – 130
Outrage – 120
Spacial Rend – 100
Dragon Pulse – 85
Dragon Claw – 80
Dragon Tail – 60
Dragon
Foul Play – 95
Crunch – 80
Dark Pulse – 80
Sucker Punch – 80
Night Slash – 70
Knock Off – 65
Pursuit – 40
Dark
Flash Cannon – 80
Iron Head – 80
Bullet Punch – 40
Gyro Ball
Steel
Moonblast – 95
Play Rough – 90
Dazzling Gleam – 80
MOAR coming soon, including a decision on Ubers/banlists. To get started, Sleep, OHKO, Species, Evasion, Moody cluases are in effect
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