As long as Dodrio is on your Bench, you pay less to retreat your Active Pokémon (excluding Pokémon-ex and Baby Pokémon).
Tri Attack トライアタック
20×
Flip 3 coins. This attack does 20 damage times the number of heads.
Trivia
Retreat Aid is very similar to the Pokémon Power of the same name possessed by JungleDodrio. The primary difference between their effects is that this card's Retreat Aid decreases Retreat Cost by twice as much as the Jungle version's, but also has restrictions on the Pokémon that can receive its effects.