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
The Vigilance ability means that your card doesnt tap when attacking
Same can be said for Specimen Collector
An attacking Assault Intercessor does battle normally with Dragon's Eye SentryWall of Razors, but it would only be able to kill one of the blockers
On the bright side, Hyper Flame only does nothing if the player has no energy to discard, so it can still deal damage if they're adequately prepared
Pokemon League Of the local Pokemon TCG events, a Pokemon League is one of the most common to encounter