My Deck

Quickly crush opponent
Format: Tournament legal
Strategy: Quickly get out my Ex pokemon, while using trainers and mewtwo to hold off the force, while I charge me ex pokemon, and defeat them with my leafeon glaceon combo.

(Total) Pokemon:
1 Bidoof BW7 106
1 Bibarel BW7 107
3 Eevee BW9 90
1 Flareon BW9 12
1 Vaporeon BW9 20
1 Espeon BW9 48
1 Leafeon BW9 11
1 Glaceon BW9 23
1 Jolteon BW9 34
2 Delibird BW7 38
1 Lugia EX BW8 108
1 Snorlax BW8 101
1 Mewtwo Promo BW 45
1 Emolga BW6 45
1 Reshiram BW1 26
1 Ho-oh EX BW6 119
1 Manaphy BW8 34
1 Durant BW8 92

(Total) Supporters/Trainers/Stadiums:
1 Potion BW1 100
1 Team Plasma Grunt BW8 125
2 Energy Search BW1 93
2 Hypnotoxic Laser BW8 123
1 Rescue Scarf BW6 115
1 Escape Rope BW8 120
1 Colress Machine BW8 119
1 Superior Energy Retrieval BW9 103
1 Cheren BW2 91
1 Scramble Switch BW8 129
1 Skyla BW7 134
1 Evolite BW8 122
1 Colress BW8 118
1 Giant Cape BW6 114
1 Pokemon Communication BW1 99

(Total) Basic Energy/Special Energy:
1 Plasma Energy BW8 127
2 Plasma Energy BW9 106
3 Blend Energy Water... BW6 118
2 Fire
2 Metal
2 Fighting
2 Psychic
2 Lightning
2 Grass
2 Dark
2 Water

I examined your list and it has too many of things and not enough numbers of them (e.g., 1x of almost 20 different pokemon as opposed to 3-4x of only 10). You also have too many types of Pokémon in this deck. Generally, the maximum amt. of types in a deck you want to have are three. Here is a revised version of your decklist based mainly around water type Pokémon. Let me know if you don't have some of the cards in this list, and I'll change it for you.

4 Eevee PLF-90
3 Vaporeon PLF-20
2 Glaceon PLF-23
2 Mewtwo-EX promo BW45
2 Emolga DRX-45
1 Manaphy PLS-34

4 Potion
2 Revive
4 Hypnotoxic Laser
3 Rescue Scarf / Float Stone
2 Energy Retrieval (NOT the superior one)
4 Ultra Ball
4 N
4 Professor Juniper
3 Skyla
2 Colress
1 Scramble Switch / Dowsing Machine / Computer Search (These three ACE SPECs would work nicely with this deck. Just test and see which works best)
1 Virbank City Gym

8 Water
2 Prism
2 DCE

I decided to try out another deck, and it worked great against my brother's super-deck.

Deck information
Deck name:White Fire
Strategy:Beat your opponent by quickly charging Kyurem

4 White Kyurem EX BC 103
4 Chandelure PF 16
4 Lampent PF 15
4 Litwick PF 14

4 Pokemon Communication BW 99
4 Energy Search BW 93
4 Rare Candy DE 100
4 Skyla BC 134
1 Crystal Edge BC 138
4 Superior Energy Retrieval PF 103

14 Fire Energy BW 106
9 Water Energy BW 107

Also, the whole point of the other deck was Ho-oh, so I didn't really want to change it. Plus, my deck wasn't very good.

You could probably drop a few of those energy in favor of some Professor Juniper or Great Ball. Or both.

Maybe. I don't have any Junipers or Great Balls at the moment, so maybe I can trade for them at the next league. Problem is, my deck goes through energy super fast, so I would rather not get rid of energy. At the moment, I'm missing 1 Skyla and 2 Rare Candies. I replaced them with a Heavy Ball, a Plasma Ball, and a Ghetsis.

Well, 23 is quite a high energy count, that's why I'm suggesting to replace a few with those cards.

Okay, here is my new decklist.

4 Chandelure PF 16
4 Lampent PF 15
4 Litwick PF 14
4 White Kyurem EX BC 103

2 Heavy Ball ND 88
1 Random Receiver DE 99
4 Energy Search BW 93
4 Superior Energy Retrieval PF 103
1 Team Plasma Ball PF 105
2 Rare Candy DE 100
4 Pokemon Communication BW 99
1 Professor Juniper BW 101
1 Cheren EP 91
2 Colress PS 118
3 Skyla BC 134
1 Crystal Edge BC 138

10 Fire Energy BW 106
8 Water Energy BW 107

2 more Fire Energy, 2 less Water Energy. After having a better look at your list, Chandelure's energy attachment method won't help you as much late in the game with the White Kyurem EX you've chosen. The Plasma Storm one might serve you better with Chandelure, as it'll do a flat 120 without having to dig up Crystal Edge if you attach even 2 of the Energy with aid from Chandelure, and you won't have to discard every time, and you can also take advantage of the damage that Chandelure's Ability would deal to it by turning it into extra damage you can do without taking damage every turn to recharge back up.