Take Jessies Arbok. Sprinkle in a little of James Weezing. Et voila. Read the decklist, then Ill explain why this deck works so well. These are all cards that are easy to get. I have 18 Arbok cards.
None of these cards have EX versions either, making cards like Muk, Weezing, and Arbok the strongest options players have at their disposal to counter powerful Psychic types like Mewtwo EX.