So when you play him down and use his Poke-Power, in theory could you take 4 prizes by using overrun from the normal Salamence and knocking out 2 Pokemon, taking 1 extra prize for each knockout, or do you just take 1 extra prize even if you knock out two Pokemon. Here's the translation for the Poke-power.
Poke-Power: Double Fall
You can use this Power once during your turn, when you play this card from your hand to Level-Up a Pokemon. During this turn, if this Pokemon Knocks Out any of your opponent’s Pokemon with damage from an attack, when you take your Prize card, take 1 additional Prize card for 1 of the Pokemon you Knocked Out.
Poke-Power: Double Fall
You can use this Power once during your turn, when you play this card from your hand to Level-Up a Pokemon. During this turn, if this Pokemon Knocks Out any of your opponent’s Pokemon with damage from an attack, when you take your Prize card, take 1 additional Prize card for 1 of the Pokemon you Knocked Out.