Starmie from RR is a nice card (40 Damage with 1 energy), and can also recycle energys, staryu can help in the start, and starmie have also no retreat
Even poliwrath LA can be good: 60 damage with 1 energy, and 90 with 3!!! You must them play with minimum 3 warp points for use the first attack againest, and can also use politoed, or double colores (reprinted in january 2010, by heartgold/soulsilver) if they come out.