You may change Cool Porygon's Resistance to a type of your choice other than Colorless. If the Defending Pokémon has a Weakness, you may change it to a type of your choice other than Colorless. (Benching either Pokémon ends the effect on that Pokémon.)
20×3-D Attack
Flip 3 coins. This attack does 20 damage times the number of heads.
“A Pokémon that consists entirely of programming code. Capable of moving freely in cyberspace.”
How much is Cool Porygon #15/53 worth?
Cool Porygon #15/53 is a Promo card from Wizards Black Star Promos (1999) — today it trades at roughly $89.98 ungraded.
Grading changes the math on this one: a PSA 10 is valued around $5,000.00, roughly 55.6x the raw price, while a PSA 9 sits near $447.98. 4,232 copies have been graded to date, and 4% 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.