(XD Dat Garbodor.)
About the fact that Gyarados requires 4 Energy to be taken down, no. That isn't correct. Eelektross' attack cost = 2 Energy. Plus 2 Energy discarded= 20x2. That is already a measly 40 damage. Add another Energy discarded, 60 damage. Both of these values are without Weakness applied. So you need 7 Energy to take out Gyarados, as opposed to Shaymin's five.
Then, there is Magikarp. A really crappy card, relying on coin flips and with a low HP. Let me tell you something. As Black and White series came around, we gained the ability to OHKO anything with 60 HP or lower with just a basic. So, to be honest, I don't think that Magikarp's 30 HP really makes a difference, as anything with 60 HP or lower is a stupid card to rely on.
Let's not forget Rare Candy. If you draw Magikarp as your only basic on your first turn (which is, actually, almost improbable) then Rare Candy is almost useless. However, in the more likely event that you get Magikarp to get on your Bench, Rare Candy works wonders.
It is Gyarados' Retreat SPECIFICALLY that enables it to use Heavy Ball. Combine that with Float Stone (Shaymin-EX is EQUAL to Gyarados when paired with Giant Cape) and Gyarados is Shaymin-EX with a better Retreat Cost. Let's not forget, you can't 'Ball Shaymin-EX which sucks.
Gyarados does 20x the amount of Prizes BOTH PLAYERS have taken. Up to 200 damage. I don't know about Shaymin-EX, but Gyarados can do a lot of damage.
So, Shaymin-EX fits better in this deck, but Gyarados is overall better.
About the fact that Gyarados requires 4 Energy to be taken down, no. That isn't correct. Eelektross' attack cost = 2 Energy. Plus 2 Energy discarded= 20x2. That is already a measly 40 damage. Add another Energy discarded, 60 damage. Both of these values are without Weakness applied. So you need 7 Energy to take out Gyarados, as opposed to Shaymin's five.
Then, there is Magikarp. A really crappy card, relying on coin flips and with a low HP. Let me tell you something. As Black and White series came around, we gained the ability to OHKO anything with 60 HP or lower with just a basic. So, to be honest, I don't think that Magikarp's 30 HP really makes a difference, as anything with 60 HP or lower is a stupid card to rely on.
Let's not forget Rare Candy. If you draw Magikarp as your only basic on your first turn (which is, actually, almost improbable) then Rare Candy is almost useless. However, in the more likely event that you get Magikarp to get on your Bench, Rare Candy works wonders.
It is Gyarados' Retreat SPECIFICALLY that enables it to use Heavy Ball. Combine that with Float Stone (Shaymin-EX is EQUAL to Gyarados when paired with Giant Cape) and Gyarados is Shaymin-EX with a better Retreat Cost. Let's not forget, you can't 'Ball Shaymin-EX which sucks.
Gyarados does 20x the amount of Prizes BOTH PLAYERS have taken. Up to 200 damage. I don't know about Shaymin-EX, but Gyarados can do a lot of damage.
So, Shaymin-EX fits better in this deck, but Gyarados is overall better.