I would also try and use some type of card, like plus power, that will allow you to do 10 more damage to the defending Pokemon that move, while you have that card out there you can use Giga Drain and therefore be able to take off more damage from Torterra
This attack does 30 damage for each heads
Once you do so, players can't take actions until the spell has finished resolving
Mega Sharpedo ex SIR #127 Mega Sharpedos SIR depicts jaws snapping through blue inferno waves, scales and bubbles textured in vivid purples and yellows for a fierce aquatic-fire fusion
(And, of course, the sweet spot is when you have very strong tribal rewards and very strong individual creatures!) Sometimes you might have to play a couple creatures that are just below the bar of normal playability, but you certainly don't want to fill your deck up with those
It's definitely doable, but it does make this less good