It is card 16 of the 132 in the official Gym Challenge checklist. If you are completing the set, mark it in your collection to keep track.
Rarity: Holo Rare. The symbol in the bottom corner confirms it at a glance, as explained in Pokémon card rarities explained.
It exists in several finishes (Holo, 1st edition). Each one has its own price; the average above is for the regular version.
Artwork by Ken Sugimori. Some collectors chase every card by the same artist: how to start (in Spanish).
Abilities
Psylink Pokemon Power
Sabrina's Alakazam always has a copy of every attack your Psychic Pokémon in play have (including their Energy costs and anything else required in order to use those attacks, such as discarding Energy cards). This power can't be used if Sabrina's Alakazam is Asleep, Confused, or Paralyzed.