If you, personally, could make one EX, who would it be, and what would it do?

I don't want to ruin anyone's, so I won't post mine.

Darkria EX

180 HP
weakness: Fighting
Resistance: Colorless
Retreat: [C]
EX rules: when this Pokemon is knocked out your opponent takes 2 prizes.

Ability: Bad Dreams: If the active Pokemon is asleep put 10 damage on that Pokemon between turns.

[D][D]= 50
The defending Pokemon is now asleep.

[D][D][C][C]= 80
You may flip a coin if heads send all energy attached to all your opponent Pokemon to the lost zone. If tails send all the energy attached to all you Pokemon to the lost zone.

emolga ex
130 hp
weakness:
resistance:fighting
retreat:
ex rule : when this pokemon is knocked out your oppenent takes 2 prizes cards.

ability: flying madness if htis pokemon is active at the start of the game you go first this effect is cancelled if your oppenents active has flying madness.

[L][C]electro ball 50
if this is your first turn this attacks base damage is 120

[c][c][c] acrobatics 100
if htis pokemon has a pokemon tool attached this attacks base damage is 50
flip a coin if heads the defending pokemon is now paralyzed

banette EX
period.

Celebi EX (I know there already was one, but Celebi is THE best Pokemon ever)

90 HP; Fire Weakness; No resistance; 0 Retreat
EX rule etc.

Ability: Leaf Song
Once during your turn, you may search your deck for a grass energy and attach it to one of your Pokemon.

(G)(C)(C) Solarbeam 70
You may move as many energy attached to your Pokemon as you like to any of your other Pokemon. (basically like Celebration Wind)

The strategy with this is: start with Celebi, attach a DCE, use its ability to attach a grass, use Solarbeam, and move the energy to your main attacker. Pretty beast in my opinion.

Magicarp EX

60HP
Weakness - +10[L]
Resistance - None
Retreat - [C]
EX rule - When this pokemon is knocked out, take one more prize card.
Magicarp EX can not evolve into Gyarados.

Splash Happy 20 [W][W]
Count the number of water Pokemon in play(both yours and your opponents). Discard that many cards from the top of each players.

Mysterious Fossil EX
(EX rule here)
150 HP
All damage done to Mysterious Fossil EX is reduced to 10. When this card is Knocked Out, discard it. This does not count as a Knocked Out Poke'mon. Mysterious Fossil EX can't attack, retreat, or be effected by any special conditions.

Serperior EX
(EX Rule)
180HP

Ability : Once during your turn, you may heal 20 damage from each of your Pokémon.

[G] Sweet Scent
Switch the Defending Pokémon with 1 of your opponent's benched Pokemon. The new Active Pokémon is now Poisoned.

[G][C] Grass Mixer 50+
This attack does 20 more damage for each [G] Energy you have in play.

Weakness: [R] x2
Resistance: [W] -20
Retreat Cost: 0

Mysterious fossil EX wins...

Rayquaza EX
Dragon Type
180HP

Ability: If the defending Pokemon is knocked out by Raquaza's Game Over attack, you win.

C Game Over 10
This attack's damage cannot be changed in any way, shape, or form.

PFWC Final Blowup 200-
This attack does 200 damage minus 10 damage for each number you choose. Then, do that much damage to Rayquaza. Discard all Energy attached to Rayquaza.

Weakness:
Resistance: F
Retreat Cost: CC

Note: The only point of being Dragon type is having no weakness.

Muaaa ha ha haaaaaaaaaa!

Heatran EX
Metal type
160HP

Ability - Forge of Doom
Once during your turn, if Heatran EX is not affected by any Special Conditions, you may use this ability. Choose either your deck or your discard pile. Then, search what you chose for a number of Pokemon tools equal to the amount of M energy attached to Heatran, plus an additional Pokemon Tool (to a maximum of 5), reveal those cards, and put them in your hand. If you searched your deck, shuffle it afterward.

RCC Fiery Army 50+
Flip a coin for each R energy in play. For each heads, this attack does 10 more damage. This attack does 10 damage to each of your opponent's Benched Pokemon for each Pokemon Tool you have in play (up to 40 damage to each Benched Pokemon).

Weakness: Water
Resistance:
Retreat Cost: CCC

Also a Pokemon Tool card:

Sword of Legends
The Pokemon that this card is attached to does 60 more damage to EX Pokemon with this Pokemon's attacks.

Manaphy EX:
160 HP
0 Retreat cost
No W or R

Manaphy control-1 water energy: 40 X the number of Mananphy EX or non in play

FLYGON EX
EX RULE (no one cares!!)
200 Hp
0 Retreat

SHEER AWSOMENESS :colorless::fire::fighting: 200 If the defending pokemon is knocked out flip a coin if heads take an extra prize card if tails discard 10 cards from the top of your opponents deck If you use the ability Victory Star to Flip agin discard any 2 energy from any pokemon

Reuniclus-EX

160HP
Weakness: Psychic (x2)
Resistance: None
Retreat Cost: 2 Colorless
(EX Rule)

Ability: Trick Room
As long as Reuniclus-EX is in play, the retreat cost of the each player's Active Pokemon is switched with the retreat cost of the Defending Pokemon.

[P][P][C] Mind Crush: 90 damage.
Discard an energy attached to the Defending Pokemon. The Defending Pokemon is now Confused.


Reuniclus has mad swag.
For anybody that got the YuGiOh Abridged "Mind Crush" reference, then... good for you.

Dragon normal types are weak to normal. Plan failed.

Also this,

Druddigon EX

[C] Type

170 HP

<cool art>

[Ability]: If your Opponent does any Damage to this Pokemon, put 3 Damage counters on the inflicting Pokemon, even if Druddigon EX is Knocked Out. Thsi abliity staps when drudigun dies.

[C][C] Slash 60+
Flip a coin. If heads this attack does 60 Damage plus 20 Damage.

[F][F][C][C] Outrage 140
Flip 2 coins. If either one of them is tails, Druddigon EX is confused.

EX Ruling

Weakness: [C] x2

Resistence: [L] -20

Retreat: [C][C]

I think this is a good, realistic card.

I was gonna make a Raikou EX, but Nintendo beat me to it. So here's a Lanturn EX instead. (Every single Lanturn ever printed except Light Lanturn has something to do with Water/Lightning typing and/or Energy cards. Just a notice. They also all have low HP despite Lanturn's best stat in VGC being HP, and it's very bulky in terms of Special....)

Lanturn EX
Water type
150 HP

Ability: Static
Once during your turn (before your attack), you may use this Ability. Each of your Active Pokemon's types is L until the end of your turn.

LC Intruding Jolt 40
Move an Energy card attached to the Defending Pokemon to another of your opponent's Pokemon.

LLC Lightning Storm
This attack does 70 damage to all Pokemon with Energy attached. You may discard all L Energy to Lanturn EX. If you do, this attack does no damage to your own Pokemon.

EX rule
Weak: Grass
Resist:
RC: CC