For a first card, good. You've picked faking up quickly.
A few problems:
1. The HP should be in white.
2. Name should be 'Umbreon ex'.
3. Shadow Wave seems too powerful, I'd take one Darkness Energy off the cost.
GC: Don't think me rude, but I'd use this correction.
Synchronise
If Umbreon ex Sparkle is affected by any Special Conditions, the Defending Pokémon is affected by the same Special Conditions.
Shadow Wave
Flip a coin. If heads, remove damage counters from Umbreon ex Sparkle equal to half the damage done to the Defending Pokémon (rounded up) (after applying Weakness and Resistance). If tails, remove damage counters equal to half the remaining HP of Umbreon ex Sparkle from the Defending Pokémon.
Psyboom
Discard all cards from your opponent's hand, and all Energy cards attached to the Defending Pokémon (before they would affect the attack).
Reason why I've changed Psyboom so much? You can't be certain your opponent has discarded all Energy cards from their hand without checking it. Also, the (before they would affect the attack) is new text that Nintendo is starting to put on some of their cards. It refers to cards such as Metal Energy, which would reduce the damage done by 10HP per card. Also, discarding every one of your opponent's Energy cards in play is a bit much.
All that aside, for the first card, as I said, it's good. 6/10.