Yes, Gligar has evolved.
@Wild_Eagle
No, I just wanted to prove that you can't judge a pokémon like that, especially if you haven't seen it for a long time. Examples: Kingler, Tauros, Squirtle, Bulbasaur, etc.
P.S. Swellow was learning Ariel Ace before the battle.
i'm up 2 speed with the anime here in the US and know for a fact that Ash's team is as follows:
Pikachu
Grotle
Monferno
Staraptor
Buizel
Gliscor