Brock's Onix #21 (Pokemon Gym Heroes | Pokemon Cards) prices are based on the historic sales
With guaranteed SR+ cards, every booster is packed with excitement
1 Trainer copies is currently being offered in a Heritage Auctions sale, where bidding has reached over $50,000 for the card
Aeromunculus Baxter, Fly in the Ointment Beast, Erudite Aerialist Benthic Biomancer Bioessence Hydra Biomancer's Familiar Cloudfin Raptor Crustacean Commando Cytoplast Manipulator Don & Leo, Problem Solvers Don & Raph, Hard Science Donatello, Gadget Master Donatello, Mutant Mechanic Donatello, Rad Scientist Donatello, Turtle Techie Donatello, Way with Machines Donatello, the Brains Donnie & April, Adorkable Duo Drelnoch Elusive Krasis Experiment Kraj Fire-Field Ogre Genghis Frog Glintwing Invoker Helium Squirter Heroes in a Half Shell Iceman and Firestar Indominus Rex, Alpha Irma, Part-Time Mutant Jason Bright, Glowing Prophet Justice, Vance Astrovik Keeper of Keys Madame Web, Clairvoyant Marcus, Mutant Mayor Merfolk Skydiver Mikey & Don, Party Planners Mirelurk Queen Mistform Mutant Mondo Gecko Ms
