Heavy Metal
This is a deck I use to have fun and deal out some major damage unexpectedly. The main attacker of this deck is Haxorus with his attack: Dragonaxe. Dragonaxe does 40 damage times the amount of Metal Energy attached to him. I found this to be very useful and an unexpected attack that can easily overwhelm your opponent. Escavalier is the secondary attacker, with the attacks: Steamroll and Slashing Strike. Steamroll for one metal and one colorless energy does 40 damage to the active Pokemon and 20 to a benched Pokemon. Slashing Strike, for one metal and two colorless energy, does 80 damage but you cannot use it your next turn. Overall this deck isn't the best, but it is definitely rewarding when you deal out massive damage with your Haxorus.
Poison Power
The name of this deck might suggest what I focused on. I use Venasaur/Beedrill as the main attackers. Both have an attack that poisons the opponents active Pokemon. The main focus of this deck is to get the poison out on the opponent's Pokemon as soon as possible. Druddigon's purpose in this deck is to stall the opponent if necessary. This deck brings out some major damage quickly because of all the poison damage. Out of all these decks I would recommend this one the most. I had a blast play testing this deck.
Smash n' Pass
This deck might be the most fun deck out of the three. The main attacker is Donphan and his attack: Spinning Turn. Spinning Turn does 40 damage for one Fighting Energy and you must switch out Donphan for a benched Pokemon. The secondary attacker is Excadrill and his attack: Reinforced Drill. Reinforced Drill does 50 base damage and can do 30 more damage if you attach a Pokemon Tool. If you attach, say a Muscle Band, you are doing 100 damage for one Fighting Energy and two Colorless Energy. The focus is to get as many Donphans you can on the bench as fast as possible. Your opponent will have a hard time splitting the damage so much between the numerous Donphans that you have. A suggestion to this deck would be to have Pokemon Center (below) as your stadium card so you could heal your benched Donphans. Muscle Bands are a must in this deck, without them your Donphans do not do much damage and it can become tedious to knock an opponent out.