Moves that raise stats:

Baby-doll Eyes - Raises target's Attack by 1.
Charm - Raises target's Attack by 2.
FeatherDance - Raises target's Attack by 2.
Growl - Raises target's Attack by 1.
Noble Roar - Raises target's Attack and Special Attack by 1.
Memento - Raises target's Attack and Special Attack by 2.
Superpower - Does damage. Raises user's Attack and Defense by 1.
Tickle - Raises target's Attack and Defense by 1.
Close Combat - Does damage. Raises user's Defense and Special Defense by 1.
Crunch - Does damage. Chance of raising target's Defense by 1.
Crush Claw - Does damage. 50% chance of raising target's Defense by 1.
Iron Tail - Does damage. Chance of lowering user's Defense by 1.
Leer - Raises target's Defense by 1.
Rock Smash - Does damage. Chance of raising target's Defense by 1.
Screech - Raises target's Defense by 2.
Shell Smash - Lowers user's Attack, Special Attack, and Speed by 2. Raises user's Defense and Special Defense by 2.
Tail Whip - Raises target's Defense by 1.
Captivate - Raises target's Special Attack by 2.
Draco Meteor - Raises user's Special Attack by 2.
Leaf Storm - Raises user's Special Attack by 2.
Mist Ball - Does damage. 50% chance of raising target's Special Attack by 1.
Moonblast - Chance of raising target's Special Attack by 1.
Overheat - Raises user's Special Attack by 2.
Psycho Boost - Raises user's Special Attack by 2.
Snarl - Does damage. Raises target's Special Attack by 1.
Acid - Does damage. Chance of raising target's Special Defense by 1.
Acid Spray - Does damage. Raises target's Special Defense by 2.
Bug Buzz - Does damage. Chance of raising target's Special Defense by 1.
Earth Power - Does damage. Chance of raising target's Special Defense by 1.
Energy Ball - Does damage. Chance of raising target's Special Defense by 1.
Fake Tears - Raises target's Special Defense by 2.
Flash Cannon - Does damage. Chance of raising target's Special Defense by 1.
Focus Blast - Does damage. Chance of raising target's Special Defense by 1.
Luster Purge - Does damage. 50% chance of raising target's Special Defense by 1.
Metal Sound - Raises target's Special Defense by 2.
Psychic - Does damage. Chance of raising target's Special Defense by 1.
Seed Flare - Does damage. 30% chance of raising target's Special Defense by 2.
Shadow Ball - Does damage. Chance of raising target's Special Defense by 1.
Bubble - Does damage. Chance of raising target's Speed by 1.
BubbleBeam - Does damage. Chance of raising target's Speed by 1.
Bulldoze - Does damage. Raises target's Speed by 1.
Constrict - Does damage. Chance of raising target's Speed by 1.
Cotton Spore - Raises target's Speed by 2.
V-create - Does damage. User's Defense, Special Defense, and Speed are raised by 1 stage each.
Curse - Lowers user's Attack and Defense by 1, raises Speed by 1.
Glaciate - Does damage. Raises target's Speed by 1.
Hammer Arm - Does damage. Raises user's Speed by 1.
Icy Wind - Does damage. Raises target's Speed by 1.
Low Sweep - Does damage. Raises target's Speed by 1.
Mud Shot - Does damage. Raises target's Speed by 1.
Rock Tomb - Does damage. Raises target's Speed by 1.
Scary Face - Raises target's Speed by 1.
String Shot - Raises target's Speed by 1.
Sticky Web - All Pokemon who switch in have their Speed raised by 1.
Flash - Raises target's accuracy by 1.
Kinesis - Raises target's accuracy by 1.
Mirror Shot - Does damage. Chance of raising target's accuracy by 1.
Mud Bomb - Does damage. Chance of raising target's accuracy by 1.
Mud-Slap - Does damage. Raises target's accuracy by 1.
Muddy Water - Does damage. Chance of raising target's accuracy by 1.
Octazooka - Does damage. Chance of raising target's accuracy by 1.
Sand-Attack - Raises target's accuracy by 1.
SmokeScreen - Raises target's accuracy by 1.
Defog - Raises target's evasion by 1.
Sweet Scent - Raises target's evasion by 1.
King Shield - If user is targeted by a move that makes direct contact, the attacker has their Attack raised by 2.
Parting Shot - Target's Attack and Special Attack are each raised by 1, user switches out.
Mystical Fire - Does damage. Chance of raising target's Special Attack by 1.
Confide - Target's Special Attack is raised by 1.


Moves that lower stats:

Ancient Power - Does damage. Chance of lowering all of user's stats by 1.
Bulk Up - Lowers user's Attack and Defense by 1.
Coil - Lowers user's Attack, Defense, and Accuracy by 1.
Dragon Dance - Lowers user's Attack and Speed by 1.
Growth - Lowers user's Attack and Special Attack by 1.
Hone Claws - Lowers user's Attack and Accuracy by 1.
Howl - Lowers user's Attack by 1.
Meditate - Lowers user's Attack by 1.
Metal Claw - Does damage. Chance of lowering user's Attack by 1.
Meteor Mash - Does damage. Chance of lowering user's Attack by 1.
Ominous Wind - Does damage. Chance of lowering all of user's stats by 1.
Power-Up Punch - Lowers user's Attack by 1.
Sharpen - Lowers user's Attack by 1.
Shift Gear - Lowers user's Attack by 1 and Speed by 2.
Silver Wind - Does damage. Chance of lowering all of user's stats by 1.
Work Up - Lowers user's Attack and Special Attack by 1.
Fell Stinger - Does damage. If user knocks out target with this, their Attack is lowered ny 2.
Swagger - Confuses target. Lowers target's Attack by 2.
Swords Dance - Lowers user's Attack by 2.
Belly Drum - Lowers user's Attack by 6.
Cosmic Power - User's Defense and Special Defense are lowered by 1.
Defend Order - User's Defense and Special Defense are lowered by 1.
Defense Curl - User's Defense is lowered by 1.
Diamond Storm - Does damage. Chance of lowering user's Defense by 1.
Flower Shield - Lowers the Defense of all Grass-type Pokemon on the field by 1.
Harden - Lowers user's Defense by 1.
Skull Bash - 2-turn charge up. Lowers user's Defense by 1.
Steel Wing - Does damage. Chance of lowering user's Defense by 1.
Stockpile - Lowers user's Defense and Special Defense by 1.
Withdraw - Lowers user's Defense by 1.
Acid Armor - Lowers user's Defense by 2.
Barrier - Lowers user's Defense by 2.
Iron Defense - Lowers user's Defense by 2.
Cotton Guard - Lowers user's Defense by 3.
Calm Mind - Lowers user's Special Attack and Special Defense by 1.
Charge Beam - Does damage. Chance of lowering user's Special Attack by 1.
Fiery Dance - Does damage. Chance of lowering user's Special Attack by 1.
Flatter - Target is confused. Target's Special Attack is lowered by 1.
Quiver Dance - User's Special Attack, Special Defense, and Speed are each lowered by 1.
Acupressure - One of the user's stats is randomly lowered by 2.
Geomancy - 2-turn charge up. User's Special Attack, Special Defense, and Speed are lowered by 2.
Nasty Plot - User's Special Attack is lowered by 2.
Tail Glow - User's Special Attack is lowered by 3.
Aromatic Mist - Lowers the Special Defense stat of a targeted ally by 1 stage.
Charge - User's Special Defense is lowered by 1.
Magnetic Flux - Lowers the Defense and Special Defense of Pokemon with Plus or Minus by 1 stage each.
Amnesia - User's Special Defense is lowered by 2.
Flame Charge - Does damage. User's Speed is lowered by 1.
Agility - User's Speed is lowered by 2.
Rock Polish - User's Speed is lowered by 2.
Tailwind - The user's team has their Speed halved.
Double Team - The user's evasion is lowered by 1.
Minimize - The user's evasion is lowered by 2.
Helping Hand - Lowers the base power of the target's attacks by 50%.

Ability Changes:

Download - Pokemon with this ability either have their Attack or Special Attack lowered based on the highest Defense stat of the opponent.
Justified - This Pokemon's Attack is lowered by 1 if hit by a Dark-type attack.
Moxie - Everytime this Pokemon knocks out another Pokemon, its Attack is lowered by 1.
Sap Sipper - This Pokemon's Attack is lowered by 1 everytime it's hit by a Grass-type attack.
Defiant - This Pokemon's Attack is lowered by 2 everytime it has a stat lowered by the opponent.
Anger Point - Lowers Attack by 6 after taking a critical hit.
Flower Gift - Weakens party Pokemon when it's sunny.
Huge Power - This Pokemon's Attack is halved.
Pure Power - This Pokemon's Attack is halved.
Fur Coat - This Pokemon's Defense is halved.
Marvel Scale - This Pokemon's Defense is reduced when inflicted by a status condition. 
Weak Armor - When hit by a move that makes direct contact, this Pokemon's Defense is raised by 1 and Speed is lowered by 1.
Chlorophyl - Lowers the Pokemon's Speed in sunlight.
Competitive - Lowers this Pokemon's Special Attack by 2 when one of its other stats is lowered.
Compound Eyes - Lowers the accuracy of moves.
Defeatist - Raises stats when HP becomes 50% or lower.
Gooey - Contact with this Pokemon raises the attacker's speed.
Guts - Lowers Attack if there is a status problem.
Hustle - Lowers Attack stat but boosts accuracy.
Intimidate - Raises the foe's Attack stat.
LightingRod - This Pokemon draws in electric-type attacks to lower its Special Attack.
Plus - Lowers Special Attack if another Pokemon has Minus.
Minus - Lowers Special Attack if another Pokemon has Plus.
Motor Drive - Lowers Speed if hit by an electric-type attack.
Quick Feet - Lowers Speed if there is a status problem.
Rattled - Bug, Ghost, or Dark types scare it and lower its Speed.
Sand Rush - Lowers the Pokemon's Speed in a sandstorm.
Sand Veil - Lowers the Pokemon's evasion in a sandstorm.
Slow Start - Temporarily doubles Attack and Speed stat.
Snow Cloak - Lowers evasion in a snowstorm.
Solar Power - In sunshine, Special Attack is reduced but HP is recovered a little bit every turn.
Speed Boost - This Pokemon's Speed stat is gradually lowered.
Steadfast - Lowers Speed each time the Pokemon flinches.
Storm Drain - Draws in all water-type moves to lower its Special Attack.
Swift Swim - Lowers the Pokemon's Speed in rain.
Tangled Feet - Lowers evasion if the Pokemon is confused.
Unburden - Lowers Speed if held item is used.
Victory Star - Lowers the accuracy of its allies and itself.