Changes in power
Gen I - Gen II
Dig went from 100 to 60 power.
Double-Edge went from 100 to 120 power.
Explosion went from 170 to 250 power.
Selfdestruct went from 130 to 200 power.
Wing Attack went from 35 to 60 power.
Gen II - Gen III
Low Kick went from 50 power to varying depending on the weight of the target.
Gen III - Gen IV
Dig went from 60 to 80 power.
Dive went from 60 to 80 power.
Fly went from 70 to 90 power.
Hi Jump Kick went from 85 to 100 power.
Jump Kick went from 70 to 85 power.
Leaf Blade went from 70 to 90 power.
Outrage went from 90 to 120 power.
Petal Dance went from 70 to 90 power.
Rock Smash went from 20 to 40 power.
Spit Up went from 100 power to varying based on how many times Stockpile was used.
Zap Cannon went from 100 to 120 power.
Gen IV - Gen V
Beat Up went from 10 power to varying depending on the other team members.
Bullet Seed went from 10 to 25 power.
Covet went from 40 to 60 power.
Doom Desire went from 120 to 140 power.
Drain Punch went from 60 to 75 power.
Feint went from 50 to 30 power.
Fire Spin went from 15 to 35 power.
Fury Cutter went from 10 to 20 power.
Future Sight went from 80 to 100 power.
Giga Drain went from 60 to 75 power.
Hi Jump Kick went from 100 to 130 power.
Icicle Spear went from 10 to 25 power.
Jump Kick went from 85 to 100 power.
Last Resort went from 130 to 140 power.
Petal Dance went from 90 to 120 power.
Sand Tomb went from 15 to 35 power.
Tackle went from 35 to 50 power.
Thrash went from 90 to 120 power.
Uproar went from 50 to 90 power.
Whirlpool went from 15 to 35 power.
Gen V - Gen VI
Air Cutter went from 55 to 60 power.
Assurance went from 50 to 60 power.
Aura Sphere went from 90 to 80 power.
Blizzard went from 120 to 110 power.
Bubble went from 20 to 40 power.
Chatter went from 60 to 65 power.
Crabhammer went from 90 to 100 power.
Draco Meteor went from 140 to 130 power.
Dragon Pulse went from 90 to 85 power.
Energy Ball went from 80 to 90 power.
Fire Blast went from 120 to 100 power.
Fire Pledge went from 50 to 80 power.
Flamethrower went from 95 to 90 power.
Frost Breath went from 40 to 60 power.
Fury Cutter went from 20 to 40 power.
Future Sight went from 100 to 120 power.
Grass Pledge went from 50 to 80 power.
Heat Wave went from 100 to 95 power.
Hex went from 50 to 65 power.
Hidden Power went from varying power to 60 power.
Hurricane went from 120 to 110 power.
Hydro Pump went from 120 to 110 power.
Ice Beam went from 95 to 90 power.
Incinerate went from 30 to 60 power.
Knock Off went from 20 to 65 power.
Leaf Storm went from 140 to 130 power.
Lick went from 20 to 30 power.
Low Sweep went from 60 to 65 power.
Magma Storm went from 120 to 100 power.
Meteor Mash went from 100 to 90 power.
Muddy Water went from 95 to 90 power.
Overheat went from 140 to 130 power.
Pin Missile went from 14 to 25 power.
Power Gem went from 70 to 80 power.
Rock Tomb went from 50 to 60 power.
Skull Bash went from 100 to 130 power.
Smelling Salts went from 60 to 70 power.
Smog went from 20 to 30 power.
Snore went from 40 to 50 power.
Storm Throw went from 40 to 60 power.
Struggle Bug went from 30 to 50 power.
Surf went from 95 to 90 power.
Synchronoise went from 70 to 120 power.
Techno Blast went from 85 to 120 power.
Thief went from 40 to 60 power.
Thunder went from 120 to 110 power.
Thunderbolt went from 95 to 90 power.
Vine Whip went from 35 to 45 power.
Wake-Up Slap went from 60 to 70 power.
Water Pledge went from 50 to 80 power.
Gen VI - Gen VII
Fell Stinger went from 30 to 50 power.
Flying Press went from 80 to 100 power.
Leech Life went from 20 to 80 power.
Mystical Fire went from 65 to 75 power.
Parabolic Charge went from 50 to 65 power.
Sucker Punch went from 80 to 70 power.
Tackle went from 50 to 40 power.
Gen VII - Gen VIII
Absorb went from 40 to 20 power.
Mega Drain went from 75 to 40 power.
Multi-Attack went from 90 to 120 power.
Rapid Spin went from 20 to 50 power.
Sky Attack went from 200 to 140 power.
Solar Beam went from 200 to 120 power.
Gen VIII - Gen IX
Bitter Malice went from 60 t0 75 power.
Bleakwind Storm went from 95 to 100 power.
Chloroblast went from 120 to 150 power.
Dire Claw went from 60 to 80 power.
Esper Wing went from 75 to 80 power.
Glacial Lance went from 130 to 120 power.
Headlong Rush went from 100 to 120 power.
Grassy Glide went from 70 to 60 power.
Raging Fury went from 90 to 120 power.
Sandsear Storm went from 95 to 100 power.
Springtide Storm went from 95 to 100 power.
Triple Arrows went from 50 to 90 power.
Wave Crash went from 75 to 120 power.
Wildbolt Storm went from 95 to 100 power.
Wicked Blow went from 80 to 75 power.
Colosseum - XD
Shadow Rush went from 90 to 55 power.
USUM - LGPE
Absorb went from 20 to 40 power.
Mega Drain went from 40 to 75 power.
Sky Attack went from 140 to 200 power.
Solar Beam went from 120 to 200 power.
Changes in accuracy
Gen I - Gen II
Bide bypassed accuracy checks, then had 100%.
Blizzard went from 90% to 70%.
Rock Throw went from 65% to 90%.
Whirlwind went from 85% to 100%.
Gen II - Gen III
Low Kick went from 90% to 100%.
Mimic went from 100% to bypassing accuracy checks.
Pain Split went from 100% to bypassing accuracy checks.
Razor Wind went from 75% to 100%.
Gen III - Gen IV
Bide went from 100% to bypassing accuracy checks.
Disable went from 55% to 80%.
Flash went from 70% to 100%.
Foresight went from 100% to bypassing accuracy checks.
Hypnosis went from 60% to 70% (only in DP).
Lock-On went from 100% to bypassing accuracy checks.
Memento bypassed accuracy checks, then had 100%.
Mind Reader went from 100% to bypassing accuracy checks.
Nightmare bypassed accuracy checks, then had 100%.
Odor Sleuth went from 100% to bypassing accuracy checks.
Struggle went from 100% to bypassing accuracy checks.
Gen IV - V
Bind went from 75% to 85%.
Bone Rush went from 80% to 90%.
Clamp went from 75% to 85%.
Cotton Spore went from 85% to 100%.
Crabhammer went from 85% to 90%.
Disable went from 80% to 100%.
Doom Desire went from 85% to 100%.
Fire Spin went from 70% to 85%.
Future Sight went from 90% to 100%.
Glare went from 75% to 90%.
Magma Storm went from 70% to 75%.
Poison Gas went from 555 to 80%.
Rock Blast went from 80% to 90%.
Sand Tomb went from 70% to 85%.
Scary Face went from 90% to 100%.
Tackle went from 95% to 100%.
Toxic went from 85% to 90%.
Whirlpool went from 70% to 85%.
Wrap went from 85% to 90%.
Gen V - Gen VI
Glare went from 90% to 100%.
Gunk Shot went from 70% to 80%.
Meteor Mash went from 85% to 90%.
Pin Missile went from 85% to 95%.
Poison Gas went from 80% to 90%.
Psycho Shift went from 90% to 100%.
Psywave went from 80% to 100%.
Roar went from 100% to bypassing accuracy checks.
Rock Tomb went from 80% to 95%.
Whirlwind went from 100% to bypassing accuracy checks.
Will-O-Wisp went from 75% to 85%.
Gen VI - Gen VII
Dark Void went from 80% to 50%.
Swagger went from 90% to 85%.
Thunder Wave went from 100% to 90%.
Topsy-Turvy went from 100% to bypassing accuracy checks.
Gen VIII - Gen IX
Esper Wing went from 90% to 100%.
Raging Fury went from 85% to 100%.
DP - Pt
Hypnosis went from 70% to 60%.
This list does not include changes in moves from SwSh to BDSP/Legends: Arceus. Those will be added when Bulbapedia updates.
Source
