AttackKnock Away
Flip a coin. If heads, this attack does 20 more damage.

Shelgon is Pokédex #372, generation 3 (Hoenn). Shelgon is a Stage 1 Dragon Pokémon with 80 HP. The card says it evolves from Bagon. In this catalog that name is Bagon (#371). The card lists Salamence, Salamence (#373) under evolves to.
Shelgon sits at 7/20 in Dragon Vault, position 7 of 21. Before it is 6 Bagon, and after it is 8 Salamence. The set belongs to the Black & White series. It was released on October 5, 2012. The printed size is 20. This checklist is longer, at 21 cards. The listed rarity is Rare Holo.
The attack Knock Away lists 10+ damage. The cost is Colorless. Flip a coin. If heads, this attack does 20 more damage. Rollout is another attack lists 50 damage. The cost is Fire, Water, Colorless. Weakness is Dragon ×2. Retreat cost is 3. The flavor text reads "Within its rugged shell, its cells have begun changing. The shell peels off the instant it evolves."
Shelgon (#372) has 17 other cards in the catalog. Those other cards are in 14 sets. The other printings with a release date run from 2003 to 2025. The earliest other card is Shelgon 20/97 in Dragon (2003). Both list 80 HP. The rarity there is Rare, and here it is Rare Holo. Mitsuhiro Arita illustrated that card, and Akira Komayama illustrated this one. Retreat cost there is 2, and here it is 3. 8 other cards of Shelgon list a different HP.
The illustrator line reads Akira Komayama. I count 239 other cards in the catalog with that illustrator.
Dragon Vault set binder is where a full Dragon Vault set goes. This card fills one slot there. A generation binder holds one card of each species. Shelgon can fill a slot in Generation 3 binder (Hoenn). I still need this card.
Flip a coin. If heads, this attack does 20 more damage.
Within its rugged shell, its cells have begun changing. The shell peels off the instant it evolves.
Dragon Vault, in the Black & White series. It was released on October 5, 2012. The printed size is 20.
7/20. It is entry 7 of 21 in this checklist.
Akira Komayama. The catalog lists 239 other cards with that illustrator.
Rare Holo.
Shelgon #372, generation 3 (Hoenn).
Knock Away (10+) and Rollout (50).