Originally Posted by kentucky_fried_torchic
no. " As long as you have more Prize cards left than your opponent,"
means as long as you have knocked out less of your opponent's pokemon.
Actually, you're right. I forgot that it's you
who takes Prize cards when you knock out
your opponent's Pokemon, not your opponent taking their own prize cards. My bad; how embarrassing. >3> It was my mistake.
So after this revelation on my lack of playing the TCG for long, it seems Vespiquen is only viable when in times of crisis. Taking into the consideration of how the scenario is with Vespiquen, it's most likely a mid-game card when both players are supposed to be on an even scale (For instance, 4 Prize [You]/ 5 Prize [Opponent] ratio). It has the capability of turning the tides in your favor, but aside from that, it's mediocre.
As said by Michael, Cherrim (Stormfront) is necessary to turn Vespiquen into an average card that helps transform it into something on par with the likes of Lv.X's, skittles Garchomp, etc. Vespiquen is a last resort type of card from the way I see it.