I think this is a pretty good strategy for a non promo meganimu deck.
The main i dea of this deck would be to get meganimu out as fast as you can
but not to attack with him but use his power which makes every grass energy
count as two. Once you get him on your bench power up an eggsecutor.....his
attack big explosion is great but with meganimu's power it makes every grass
cout as two so thats a chance at 40 with only one grass energy. Also as a
backup I use scyther since he is one of the best basics in the game. Also i
have put ecola gym to keep those much needed energy cards
PS.. Here is my meganimu deck.....(try to be original though)
4xChicolorita
4xMeganimu 
4xEggsecute
4xEggsecutor
4xScyther
4xPokemon Breeder
2xItem Finder
3xComputerd Search
2xEcola Gym
3xBill
3xProfessor Utsugi
23xGrass Energy
~~~~~~Later
    TheGreatOne