The game files store 101 as a sentinel for moves that cannot miss, so this move never misses.
Learn list
Pokemon that learn Iron Defense
Aegislash (Blade Forme)
Steel / Ghost · 500
Aegislash (Shield Forme)
Steel / Ghost · 500
Aggron
Steel / Rock · 530
Mega Aggron
Steel · 630
Appletun
Grass / Dragon · 485
Araquanid
Water / Bug · 454
Archaludon
Steel / Dragon · 600
Armarouge
Fire / Psychic · 525
Aurorus
Rock / Ice · 521
Avalugg
Ice · 514
Hisuian Avalugg
Ice / Rock · 514
Barbaracle
Rock / Water · 500
Mega Barbaracle
Rock / Fighting · 600
Bastiodon
Rock / Steel · 495
Beedrill
Bug / Poison · 395
Mega Beedrill
Bug / Poison · 495
Blastoise
Water · 530
Mega Blastoise
Water · 630
Ceruledge
Fire / Ghost · 525
Chesnaught
Grass / Fighting · 530
Mega Chesnaught
Grass / Fighting · 630
Cofagrigus
Ghost · 483
Corviknight
Flying / Steel · 495
Crabominable
Fighting / Ice · 478
Mega Crabominable
Fighting / Ice · 578
Empoleon
Water / Steel · 530
Excadrill
Ground / Steel · 508
Mega Excadrill
Ground / Steel · 608
Falinks
Fighting · 470
Mega Falinks
Fighting · 570
Flapple
Grass / Dragon · 485
Forretress
Bug / Steel · 465
Garganacl
Rock · 500
Glimmora
Rock / Poison · 525
Mega Glimmora
Rock / Poison · 625
Golurk
Ground / Ghost · 483
Mega Golurk
Ground / Ghost · 583
Heracross
Bug / Fighting · 500
Mega Heracross
Bug / Fighting · 600
Kingambit
Dark / Steel · 550
Klefki
Steel / Fairy · 470
Kommo-o
Dragon / Fighting · 600
Lucario
Fighting / Steel · 525
Mega Lucario
Fighting / Steel · 625
Lycanroc (Dusk Form)
Rock · 487
Lycanroc (Midday Form)
Rock · 487
Lycanroc (Midnight Form)
Rock · 487
Mawile
Steel / Fairy · 380
Mega Mawile
Steel / Fairy · 480
Metagross
Steel / Psychic · 600
Mega Metagross
Steel / Psychic · 700
Mr. Rime
Ice / Psychic · 520
Mudsdale
Ground · 500
Orthworm
Steel · 480
Pinsir
Bug · 500
Mega Pinsir
Bug / Flying · 600
Reuniclus
Psychic · 490
Rhyperior
Ground / Rock · 535
Runerigus
Ground / Ghost · 483
Sandaconda
Ground · 510
Scizor
Bug / Steel · 500
Mega Scizor
Bug / Steel · 600
Scolipede
Bug / Poison · 485
Mega Scolipede
Bug / Poison · 585
Scrafty
Dark / Fighting · 488
Mega Scrafty
Dark / Fighting · 588
Sinistcha (Masterpiece Form)
Grass / Ghost · 508
Sinistcha (Unremarkable Form)
Grass / Ghost · 508
Skarmory
Steel / Flying · 465
Mega Skarmory
Steel / Flying · 565
Slowbro
Water / Psychic · 490
Galarian Slowbro
Poison / Psychic · 490
Mega Slowbro
Water / Psychic · 590
Slowking
Water / Psychic · 490
Galarian Slowking
Poison / Psychic · 490
Steelix
Steel / Ground · 510
Mega Steelix
Steel / Ground · 610
Galarian Stunfisk
Ground / Steel · 471
Torkoal
Fire · 470
Torterra
Grass / Ground · 525
Toxapex
Poison / Water · 495
Tyranitar
Rock / Dark · 600
Mega Tyranitar
Rock / Dark · 700
Tyrantrum
Rock / Dragon · 521
Vanilluxe
Ice · 535
Vivillon (Archipelago Pattern)
Bug / Flying · 411
Vivillon (Continental Pattern)
Bug / Flying · 411
Vivillon (Elegant Pattern)
Bug / Flying · 411
Vivillon (Fancy Pattern)
Bug / Flying · 411
Vivillon (Garden Pattern)
Bug / Flying · 411
Vivillon (High Plains Pattern)
Bug / Flying · 411
Vivillon (Icy Snow Pattern)
Bug / Flying · 411
Vivillon (Jungle Pattern)
Bug / Flying · 411
Vivillon (Marine Pattern)
Bug / Flying · 411
Vivillon (Meadow Pattern)
Bug / Flying · 411
Vivillon (Modern Pattern)
Bug / Flying · 411
Vivillon (Monsoon Pattern)
Bug / Flying · 411
Vivillon (Ocean Pattern)
Bug / Flying · 411
Vivillon (Poké Ball Pattern)
Bug / Flying · 411
Vivillon (Polar Pattern)
Bug / Flying · 411
Vivillon (River Pattern)
Bug / Flying · 411
Vivillon (Sandstorm Pattern)
Bug / Flying · 411
Vivillon (Savanna Pattern)
Bug / Flying · 411
Vivillon (Sun Pattern)
Bug / Flying · 411
Vivillon (Tundra Pattern)
Bug / Flying · 411
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