From Bulbapedia, the community-driven Pokémon encyclopedia.
A Horsea-Seadra Artbox Flipz Action 3D's card
Pokémon Lenticular Cards are a series of collectible cards that give the illusion of a moving image when tilted, either an evolutionary line or of a single Pokémon species. The name "lenticular" refers to the cards structure, being biconcave. These cards are also known as three-dimension holograms.
On the back of the cards, across all sets, the Pokémon's name, height, weight, and evolved forms (when applicable) are shown, sometimes followed by a description.