Careful what you say - Gen 8 Hackmons players have already been exposed to this Spicy Spray kind of status spreading.
...In the form of the infamous Cramorant-Gorging.
Originally a haha funny meme in Metronome Battle (the first meta to try Cram-Gorging for the paralysis), Cramorant-Gorging revealed its true power in SwSh Balanced Hackmons and Pure Hackmons where it can paralyze multiple unlucky Pokemon with careful switch-ins. Admittedly, it also inflicts 25% chip when getting hit, but it lost its paralyzing ability and had to recharge it by using Surf/Dive or switching out and back in (thus why it was merely a meme in Metronome Battle, where switching cannot occur, but a true menace in 6v6 metas like both Hackmons).
It did not take long for SwSh Balanced Hackmons to ban Cramorant-Gorging. Even the threat of paralyzing a mon by switching Cramorant-Gorging in was too much, let alone actually crippling a sweeper or even two that way.
Cramorant-Gorging rocketed to the A ranks in viability in SwSh Pure Hackmons, a significantly more defensive meta revolving around a Pokemon form that can opt to take essentially no damage from non-fixed damage physical or special attacks: Eternatus-Eternamax. Due to being a more defensive meta, Cramorant-Gorging could often threaten to paralyze the entire opposing SwSh Pure Hackmons team except for Electric-types (mainly Regieleki), Comatose users, and Flame Orb users (mainly Neutralizing Gas Eternamax). Getting paralyzed is disastrous in SwSh Pure Hackmons, a meta where Substitute is king for absorbing OHKO moves (the most reliable way to take down Eternamax), and Taunt is therefore prince for blocking Substitute. While I am a fan of putting Surf on Cramorant-Gorging so it wins 1v1s against Eternamax, my fellow rivals in high-level SwSh Pure Hackmons games (e.g. aerobee) generally were not. Simply spreading paralysis (and threatening to always do so or force switches with Taunt) was that good.
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Mega Scovillain has around Cramorant-Gorging levels of bulk (deceptively good bulk in the right hands) but has the glaring problem of needing to Mega and stay in for a turn to get its disastrous ability active. If it opts to Protect so it can try the switch-in threat later, it invites opposing mons to set up in its face. Spicy Spray has a great predecessor in Cramorant-Gorging's Gulp Missile, so I too suspect UU is the worst Mega Scovillain can get. Mega Scovillain is absolutely leaning on how many opposing mons it can burn before it gets KOed, though (although one physical sweeper is already victory based on SwSh Balanced Hackmons's example, and 2 physical sweepers is gravy), and it might have to try going for burns on attack the first turn it is out.