A decent start, but Treecko is spelt incorrectly. When creating a new card. You will want to add an effect such as "This Pokémon also does 10 damage to itself" or "If you have Tyranitar in play, this attack does 200 more damage" for example. It would also help if you had an Ability that will be useful for the players. This can range to Pokémon tasking less damage from attacks or Pokémon having no Retreat Cost if the correct conditions are met. For example, I could do a Lugia card that had the Ability of Rainbow Wing with the effect "If you have Ho-Oh in play, this Pokémon has no Retreat Cost". This means that I could give Lugia a Retreat Cost of 2 for example, so that the only way it would have no Retreat Cost is if I had at least one Ho-Oh card in play.
Be creative, but keep the balance just right, it does, after all, need to look as if you can play it in a legal tournament.