AbilityFree Flight
If Gligar has no Energy cards attached to it, Gligar's Retreat Cost is 0.

Gligar is Pokédex #207, generation 2 (Johto). Gligar is a Basic Fighting Pokémon with 50 HP. The card lists Gliscor, Gliscor (#472) under evolves to.
Gligar sits at 57/115 in Unseen Forces, position 59 of 145. Before it is 56 Flaaffy, and after it is 58 Gloom. The set belongs to the EX series. It was released on August 1, 2005. The printed size is 115. This checklist is longer, at 145 cards. The listed rarity is Common.
Free Flight is listed as Poké-Body. If Gligar has no Energy cards attached to it, Gligar's Retreat Cost is 0. The attack Toxic Grip lists 10 damage. The cost is Fighting. The Defending Pokémon is now Poisoned. Weakness is Lightning ×2. Retreat cost is 1.
Gligar (#207) has 17 other cards in the catalog. Those other cards are in 16 sets. The other printings with a release date run from 2000 to 2025. The earliest other card is Gligar 59/111 in Neo Genesis (2000). That card lists 60 HP, and this one lists 50 HP. Both list the rarity Common. Hironobu Yoshida illustrated that card, and Mitsuhiro Arita illustrated this one. 15 other cards of Gligar list a different HP.
The illustrator line reads Mitsuhiro Arita. I count 721 other cards in the catalog with that illustrator.
Unseen Forces set binder is where a full Unseen Forces set goes. This card fills one slot there. A generation binder holds one card of each species. Gligar can fill a slot in Generation 2 binder (Johto). Themed lists that include this exact card are Mitsuhiro Arita cards. I still need this card.
If Gligar has no Energy cards attached to it, Gligar's Retreat Cost is 0.
The Defending Pokémon is now Poisoned.
Unseen Forces, in the EX series. It was released on August 1, 2005. The printed size is 115.
57/115. It is entry 59 of 145 in this checklist.
Mitsuhiro Arita. The catalog lists 721 other cards with that illustrator.
Common.
Gligar #207, generation 2 (Johto).
Toxic Grip (10).