Having trouble beating Celadon Gym? This level is pretty hard. I had to go through it a couple times before I figured out how to beat it. To start, I would bring an Alakazam with Physchic and Calm Mind. Recover also can be useful. I would also bring an Arcanine with Fire Fang, A Charizard with a strong fire move, and A Butterfree with a strong Flying move. You can pick the pokemon you think would be most useful for the other two slots. Erika's pokemon can come from four different paths; the top left, top right, bottom left, and
bottom right corners of the screen. In the beginning they come in a pattern for each wave. The first wave or two are top left, then the next wave or two is bottom left, then after that comes top right and bottom right. The easiest way to complete the level is by putting a Charizard using a fire move closest to where the pokemon come out, and then a Alakazam with Physchic as a backup. Remember to use Calm Mind with Alakazam each time you place him in a new spot. If any of your pokemon die, replace them with Arcanine or Pidgeotto, while using the same strategy. Every pokemon is a grass pokemon and should be killed fairly easily with the exception of Celebi. Celebi is impossible to kill and can quickly wipe out your pokemon. Celebi comes on waves 3,5,7,9,11, and 13. Every time one of these waves starts, remove your pokemon from its path. Yes, it will get the candy, but as long as you kill every other pokemon you will win. This is the best way I have found to beat Celadon Gym in Pokemon Tower Defense, I hope it works for you! A Complete Pokemon Tower Defense Walkthrough Here: http://pokemontowerdefensewalkthrough.blogspot.com/