Goth does 90 for 3 if you have 3 psychic energy on it, right? That means, less damage if you abuse DCE (50 instead of 90) or much longer charge time if you want more damage.
Either way, 3 energy attacks is well welcomed in a format filled (currently) with >2 energy attacks as the norm.
Honestly, I see HGSS greats making a big appearance. Donphan Prime and Jumpluff are my top 2 picks for next season, rare candy neuter, lack of BTS or not.
I 'aint fraid of no Goth.
edit: Also, one attack leaves Goth vulnerable to attacks that restrict the use of one attack, or make it cost more. (lack of options)
I'd rather have use of my Poke-Powers than my trainers, in my honest opinion. But in a format without uxie and claydol, I'm not sure if that is going to make a difference.
don't forget about Yanmega Prime. Try 70 damage or a 40 damage anywhere-snipe for NO energies and minimal set-up...
I'm betting Yanmega/Donphan or pure Yanmega will be the fastest deck around come next (tentatively) HG-SS on format.