>>46648604Slowking-Galar has great stats, Regenerator for longevity with Assault Vest, gen 1 coverage, and a strong STAB Future Sight to light a fire under opponents' asses. That last one is a big reason why it's such good shitmon support.
As for Coalossal, it's great for 3 reasons. Steam Engine quadruples its speed when it gets hit with a water or fire attack. Weakness Policy doubles its offenses when it gets hit with a water, ground, fighting, or rock attack. So just hitting it with a water attack makes it an obscenely fast and strong beast. And to top it off, its GMax move not only lets it use strong (and accurate) Rock attacks without removing the sun and weakening its Fire attacks, but it also sets up a condition that causes frankly ridiculous chip damage (each non-Rock type opponent takes 1/6 damage for 4 turns. Since VGC is 4v4 and that's 2 mons taking 1/6 each for 4 turns, that's an entire third of the opponents' HP pool gone from chip damage alone. From one move. A move that also does regular damage.
I'm not sure what makes Coalossal so good at supporting shitmons, though. Just what makes it good on its own.