Vileplume + Butterfree

When this deck works, you feel invincible. It sucks early game and it is sometimes hard to get the right pull to evolve your vileplume. Once you have vileplume it gets easier to stall and get your butterfree. Basically, make use of the caterpie's "Find a friend" attack to get more pokemon into your hand, this doesnt just pull basic like pokeball does, but any grass pokemon. Having two butterfree and one vileplume is crazy since each butterfree can use the ability to heal you and any other benched pokemon for 20 each. Vileplume is also tanky enough to absorb a couple hits and will likely sleep the opponent's active pokemon which prevents attacks or retreats.