From Bulbapedia, the community-driven Pokémon encyclopedia.
Secret Techniques (Japanese: ヒジュツ Secret Technique) are skills that a partner Pikachu or Eevee can learn and use outside of battle in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!. Like HM moves or Poké Rides, Secret Techniques can clear obstacles or transport the player.
According to the captain of the S.S. Anne, Secret Techniques are typically performed by humans, but the player's partner has an unusual affinity for the abilities, and is able to perform them for the player.
After the player has become Champion, they gain the ability to ride Charizard, Aerodactyl, or Dragonite in the sky, allowing them to bypass Chop Down and Sea Skim obstacles.
List of Secret Techniques
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