>>53675648grass -> grass/fairy (or dragon)
>statsHP 80 -> 110 (+30)
atk 82 -> 52 (-30)
def 100
spa 83 -> 113 (+30)
spdef 100
spe 80 -> 50 (-30)
>abilityleaf guard -> triage
>movepoolstrength sap
healing wish
rage powder
moonblast
heal pulse -> purify
bulky calm mind + priority giga drain sounds great, access to priority strength sap stops physical threats and while nasty plot would be better it would hit way too hard
>calm mind/ giga drain/ strength sap (synthesis)/ moonblastin doubles purify would be an amazing niche cause the grass type + priority healing counters amoongus (as long as you have another partner), pollen puff isn't strong enough to break meganium and they rarely run any poison move to consider besides clear smog, which can be outhealed by synthesis/strength sap
>purify/ rage powder/ strength sap (giga drain/ synthesis)/ helping hand (bulldoze/ giga drain) (or even screens)probably not the greatest mon but suddenly it has a niche in both singles and doubles, 110/100/100 is great bulk but grass is not the best defensive typing most of the time, that being said, this meganium would be a huge problem for several meta threats like palafin, tusks, bundle, iron hands and so on