Can Rillaboom run its Gigantamax form over its Dynamax form?
When in its it's Gigantamax form Rillaboom gets access to
G-Max Drum Solo. G-Max Drum Solo always deals has a 160 BP, which is the highest gmax/max move base power in the game. This means even grassy glide will be hitting 160 BP(although ircc, rillaboom will then run 2 grass stab) In addition, it ignores the opponent's ability so it can hit through Fur Coat Persian-A, and Sap-Sipper Miltank.
Comparatively, Max Overgrowth only summons grassy terrain and has a lower BP. And since Rillaboom already summons grassy terrain upon dynamaxing this makes Max Overgrowth significantly less useful.
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In continuation, of the Cloud Nine posts above, I believe Drampa should have cloud nine stripped from it completely, or at the very least force it to run Berserk if it's running Roost. Cloud Nine is far too niche on it, only helping it reduce the power of fire moves in sunlight, and water moves in rain, which it already resists. Slush Rush and Sand Rush pokemon also outspeed it as well, even without their speed bonus. I guess it's useful against rock types that get an SpD buff in sand, but that'll rarely come into play....
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Allowing Contrary Shuckle. Ok don't get my wrong, sturdy is a great ability, and far superior to contrary a good portion of the time. Sturdy allows Shuckle to always set-up webs which are arguably the best hazard in the game. IF it already hasn't taken hazard damage. If shuckle is running not running HDB, you can still get OHKOed with hazard support.
Also, it's important to mention that very few threats can reliably OHKO Shuckle, with them being Dracovish (62.5%), full health choice specs Wailord, kygore, choice specs Pelipper, and a few other rain boosted pokemon. Sure some set-up pokemon can OHKO shuckle, but you definetly don't want them to set-up and Dynamax on you in the first place.
So what does Contrary do? Well not much... However, Contrary can turn possible 2HKO's from Max Darknesses and Max Phantasms into 3HKO's or even 4HKO's after the pokemon reverts to it's normal stage. Stalling Dynamax can give Shuckle another use after it's set up webs. Also although very niche, it can also benefit from the wide variety of moves that drop defence/spd including shadow ball, crunch, psychic, apple acid, fire lash etc.
I'm not saying Shuckle shouldn't run Sturdy. I'm not even saying Contrary should be run more than 20% of the time. However I do I propose Shuckle, have a small chance to run Contrary if it's not running boots, and is not a lead. Just the ability for shuckle to have Contrary can scare away Max Darkness and Max Phantasms.
Ok I'll be honest this argument is much worse than the other ones, and flawed then the others ones