It is card 6 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
Fortitude Pokemon Power
If Giovanni's Machamp would be Knocked Out by an opponent's attack, flip a coin. If heads, Giovanni's Machamp is not Knocked Out and its remaining HP become 10 instead. This power can't be used if Giovanni's Machamp is already Asleep, Confused, or Paralyzed.
Attacks
FightingFightingFightingColorless
Hurricane Punch
30x
Flip 4 coins. This attack does 30 damage times the number of heads.