By A Mystery Man Writer
In the earlier Pokemon games, players had to use an HM to perform certain tasks that also doubled as moves.
Talk:TMs and HMs - Pokemon Black 2 and White 2 Guide - IGN
Top 5 HM Slaves
The Ghetto HM Slave : r/pokemmo
Pokémon: Every HM, Ranked According To Its Use
Top 10 HM Slaves in Pokémon - LevelSkip
HM Slaves and You! The PokéCommunity Forums
Pokemon Emerald: The 16 Best Hoenn HM Mules
20 Best Hoenn HM Slaves For Pokémon Ruby, Sapphire & Emerald (And ORAS) – FandomSpot
HM Slave [PART 2] by sparklingdemon on DeviantArt
Top 10 HM Slaves in Pokémon - LevelSkip
Top 5 HM slaves in Pokemon
Best Kanto HM Slaves in FireRed & LeafGreen (And Gen I R/B/Y) – FandomSpot
A concept for the best HM Slave : r/PokemonUnite
Best HM Slave Pokemon Heartgold - Pokewolf