Mount Boost
From Pixelmon Wiki
Description
Mount Boost is a move skill that can be used by any Pokémon that knows either the move Agility or Extreme Speed, or is any of the following Pokémon: Garchomp, Dragonite, Latios, Rapidash, or Arcanine.
Mount Boost's cooldown timer is different depending on the Pokémon's Speed stat. The formula used is 60 seconds minus 20 or the Pokémon's Speed stat divided by 10, whichever is smaller.