His first attack, Dragon Claw, is hardly exciting. 30 damage for 2 colorless energy simply doesn't do much for anybody. His other attack, Dragon Strike, deals 130 damage for 2 Fire, 1 Electric, and 1 Colorless Energy. However, it's one of those coin flip attacks, so if you hit tails, Rayquaza EX can't use Dragon Strike the next turn. This doesn't seem all too fun.
However, the great news is that Rayquaza EX curves out perfectly into his Mega Evolution.
The other cool thing is what sets this Mega Evolution apart from the other one. It has the ability to reduce damage taken from Grass, Fire, Water, and Electric Pokemon by 20 - after applying Weakness and Resistance. Like all Dragon Pokemon nowadays, Rayquaza EX and Mega Rayquaza alike have 2x weakness to Fairy-type Pokemon.
230 HP isn't quite as high as other Mega Evolutions, but the attack power is formidable. This raw power made this version of Mega Rayquaza EX a #1 Best Seller among new Single Card releases on Amazon.
The second attack isn't quite as exciting, but it takes three Colorless energy and deals 100. The cost is discarding the top 3 cards of your deck. It's not the worst drawback, and this being colorless makes it quite versatile.
So what will the second Mega Evolution look like?
This Mega Rayquaza has an attack called Emerald Break, which costs 3 Colorless energy and deals 30 damage for each of your Benched Pokemon. This limits its power to 150 raw damage, but considering you could unleash this damage on Turn 2 with no drawback is really impressive.
The cool thing about having two Mega Evolutions is that you can choose which Mega to use. Still, it's clear that #60 and #61 go together and #75 and #105 go together. Overall, the first pair has better synergy and more overall power. But the second pair trades raw power for splash-ability and an ability to strike quickly.
Which pair do you like better?