If you have to put Gothorita into play, I would recommend using Psybeam for sure the first turn so you can for sure do some damage and confuse the defending Pokemon, then depending on how lucky you're feeling would determine if you would use Double Slap which has the potential to do 40 damage, or Psybeam which does 20 damage every turn the next turn
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A generic blister pack that contains a promo card, wont be worth as much because it is cheap to begin with, readily available almost anywhere, and the cards themselves usually arent that sought after
The Tropical Mega Battle was said experimental approach, and sounds like something directly taken from a television show, if were honest