So, Yveltal is like Mewtwo, right? Only Mewtwo was misunderstood and mistreated, while Yveltal is just an evil bastard (probably). Pokemon (9) 3 Yveltal (XY 78) 3 Yveltal EX (XY 79) 2 Darkrai EX (all set versions acceptable, but NOT the tin one) 1 Keldeo EX (BC 142, but I guess the others are ok) T/S/S (37) 4 Professor Juniper 4 N 4 Random Receiver 4 Bicycle 4 Ultra Ball 4 Dark Claw 4 Dark Patch 4 Energy Switch 2 Max Potion 1 Dowsing MCHN 2 Shadow Circle Energy (14) 4 Double Colourless 10 Dark Start Baby Yveltal, do damage and accelerate Energy, then kill stuff with Big Yveltal's Evil Ball. Heal with Max Potion if you want: you got E Switch/Patch. Darkrai and Keldeo because free retreat and switching is nice to have. Shadow Circle because screw toolboxes and tech Raichu/Dugtrio. Those decks don't really have room for kickgyms, so you're good. 4 of things because that's how I like it, and it's a good place to start. On the other hand, if you enjoy making a dog's dinner out of your deck, then you could consider: Mr Mime Enhanced Hammers Sableye Laser (with or without Bank. Evil Ball +10 hits odd numbers without adding more Energy) Tool Scrapper Catcher Frozen City Professor's Letter But not all at once.