Hey there, Charles! Good to see you here in TCG!
You're right about one thing; these cards are very old. I'm guessing you don't have many of the new ones, so it's difficult to make suggestions about replacements and such.
I will say, however, that you seem to have a lot of really thin evolutionary lines... I count six, all of which are in two stages (Magikarp/Gyarados, Psyduck/Dark Golduck, Natu/Xatu, Wingull/Pelipper, Chinchou/Lanturn, Voltorb/Dark Electrode). If possible, you should drop some of these Pokemon in order to strengthen the other evo lines. That'll make it easier to get the evolution you need when you need it. If you could whittle it down to about three or four lines, it might work considerably better. Also, reducing the deck from three types (Psychic, Water, Electric) to two would also help you with energies.
That said, it's clear that there's no real tactic here, so I'm not going to lie and say you'll be able to legitimately compete with high-level decks. But you should at least be able to increase the effectiveness of what you've set up if you carefully reduce the number of evo lines. I assume that's what you wanted. ^_^