Once during your turn (before your attack), you may search your deck for another Deoxys ex and switch it with Deoxys ex. (Any cards attached to Deoxys ex, damage counters, Special Conditions, and effects on it are now on the new Pokémon.) If you do, put Deoxys ex on top of your deck. Shuffle your deck afterward. You can't use more than 1 Form Change Poké-Power each turn.
Attacks
50Fastwave
This attack's damage isn't affected by Resistance, Poké-Powers, Poké-Bodies, or any other effects on the Defending Pokémon.
How much is Deoxys ex #17/17 worth?
Deoxys ex #17/17 is a Rare card from POP Series 4 (2006) — today it trades at roughly $299.00 ungraded.
Grading changes the math on this one: a PSA 10 is valued around $4,200.00, roughly 14.0x the raw price, while a PSA 9 sits near $2,901.25. 27 copies have been graded to date, and 7% 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.