It exists in several finishes (Normal, 1st edition). Each one has its own price; the average above is for the regular version.
Artwork by Atsuko Nishida. Some collectors chase every card by the same artist: how to start (in Spanish).
Attacks
Colorless
Messenger
Put Koga's Pidgey and all cards attached to it on top of your deck. Then search your deck for any Basic Pokémon or Evolution card not named Koga's Pidgey. Show that card to your opponent, then put it into your hand. Shuffle your deck afterward.