You know what else gets substitute, swords dance, and iron head?
Aegislash, Arceus, Bewear, Bouffalant, Chesnaught, Chespin, Cobalion, Cranidos, Cubone, Dhelmise, Diggersby, Doublade, Escavalier, Excadrill, Exeggutor-Alola, Ferrothorn, Garchomp, Golisopod, Groudon, Hakamo-o, Hawlucha, Honedge, Incineroar, Jangmo-o, Komala, Kommo-o, Lycanroc, Marowak, Marowak-Alola, Mawile, Mew, Necrozma, Pancham, Pangoro, Pawniard, Quilladin, Rampardos, Rayquaza, Rhyperior, Sandshrew-Alola, Sandslash-Alola, Scizor, Silvally, Skarmory, Smeargle, Stufful, Terrakion, Torterra, and Type: Null
So it's not that special