As often as you like during your turn (before your attack), you may attach 1 Water Energy card to 1 of your Water Pokémon. (This doesn't use up your 1 Energy card attachment for the turn.) This power can't be used if Blastoise is Asleep, Confused, or Paralyzed.
Attacks
40+Hydro Pump
Does 40 damage plus 10 more damage for each Water Energy attached to Blastoise but not used to pay for this attack's Energy cost. You can't add more than 20 damage in this way.
“A brutal Pokémon with pressurized water jets on its shell. They are used for high-speed tackles.”
How much is Blastoise #2/130 worth?
Blastoise #2/130 is a Rare Holo card from Base Set 2 (2000) — today it trades at roughly $151.83 ungraded.
Grading changes the math on this one: a PSA 10 is valued around $7,500.00, roughly 49.4x the raw price, while a PSA 9 sits near $692.50. 10,924 copies have been graded to date, and 1% of them came back a 10 — worth knowing before you pay grading fees.
These figures come from nightly market-data syncs verified against completed sales. Use the chart above to see the trend before you buy or sell.