Although other contact moves are also affected by the Ability, they cannot be learned by any Pokémon with Long Reach. They may, however, be called via Metronome, Mirror Move, Copycat, or Mimic, or be used by a Pokémon that gained Long Reach by an Ability like Trace or Receiver or a move such as Skill Swap or Role Play.
In Pokémon UNITE, Long Reach is Decidueye's Ability. It increases damage dealt to distant enemies by 20%. Additional damage added per level from each move's damage formula is excluded from this bonus.
Trivia
In the Brazilian Portuguese version of Pokémon UNITE, Long Reach's localized name is formatted as "Longo alcance", with the starting letter of only the first word capitalized. This may be due to an overlap with the Ranged attack type.