21 pokemons

1 Dugtrio (strong attack)
3 Diglett (to evolve into Dugtrio, free retreat)
3 Machop (for a quick 20) 2 Charmeleon (good attacks)
3 Charmander (to evolve into Charmeleon)
2 Magmar (can do a lot of damage)
3 Ponyta (for a quick 30 damage)
1 Raticate (to attack pokemon with high HP with it's hyper fang)
2 Rattata (for a quick 20 damage and to evolve into Raticate)
1 Chansey (high HP, for 1 hit K.O.)

9 Trainer cards

2 Bill (to use after pokedex)
1 Potion (help chansey stay longer)
1 Revive (if a good pokemon is knocked out)
1 Plus Power (to make our attacks stronger)
1 Gust of Wind (to get opponent's weaker pokemons out)
2 Pokedex (to organize the deck)
1 PLus power (to gain strengh of pokemon)

16 fire energy, 14 fighting energy

The stratergy of this deck is to do a lot of damage in a short time, so the pokemons here are strong and most of them don't have to evolve.