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>+50 HP even with 120/102/102 bulk its typing means it still can't wall for shit.
>replace Swarm with Queenly Majesty because it's thematicly fitting even if it doesn't help it much.
>Buff its 3 signature moves
>Attack order, bug STAB ain't great, maybe change its secondry effect to infestation trapping, so it's like an accurate bug type magma storm, could make for a cool toxic stall set.
>Defend Order, +1 to Def and SpDef is already pretty good just not worth a slot, +2 would be kinda rediculous
>Heal Order, it's just roost, make it heal status or make it like shore up, heal more in sun/terrain or something.
Regardless these wouldn't make Vespiquen OU, a HP buff or Bug/Steel type would be needed for any chance of a decent Mega, unless the min/maxed it to hell like a certain other bee pokemon...