Toxapex has decent bulk and an interesting defensive typing, possessing an array of resistances to Fairy-, Fighting-, Steel-, Water-, Ice- and Fire-type moves as well as the ability to absorb Toxic Spikes upon switching in. This allows Toxapex to take full advantage of its access to Haze, easily switching in on dangerous special sweepers such as Calm Mind Arceus formes, Xerneas, and Palkia and removing their stat boosts. In particular, Toxapex is one of the most reliable answers to Z-Geomancy Xerneas in the game. Toxapex's resistances also allow it to soft check some physical sweepers, such as Mega Lucario and Blaziken; however, it needs a timely Scald burn to beat Mega Lucario. Toxapex possesses excellent recovery options in Recover and Regenerator, further cementing its efficacy as a defensive pivot on some stall teams. Unfortunately, Toxapex has virtually no offensive presence, completely relying on poison and Scald burns to do any meaningful damage, and will almost always move last due to its awful Speed. Toxapex is easily shut down by Taunt users, especially Mega Gengar. A crippling weakness to Ground-type moves leaves Toxapex unable to deal with most physical attackers, and it is very easily forced out by most Swords Dance Arceus formes and Primal Groudon. Toxapex also possesses a horrible weakness to Psychic-type moves, which means that the number of special attackers it can actually check in practice is disappointingly low; in particular, it is extremely vulnerable to Deoxys-A, Lunala, and Mewtwo, as well as Choice Specs Xerneas that carry Psychic-type coverage. Toxapex's low HP is burdensome, detracting from its fantastic defensive stats, rendering it overwhelmed by strong attackers such as Choice Specs Yveltal, and forcing it to run Wacan Berry over the more useful Leftovers for the sole purpose of avoiding being 2HKOed by Thunder from a boosted Geomancy Xerneas. These flaws mean that Toxapex can only fit on stall teams and requires significant support from its team to work.
Arceus-Bug can pose some threat to certain Psychic- and Dark-types in Ubers, such as Mewtwo that lack Fire Blast and Arceus-Dark. However, Arceus-Bug has an atrocious defensive typing that gives it a Stealth Rock weakness and weaknesses to common Rock-, Fire-, and Flying-type moves. Arceus-Bug's resistances to Fighting-, Ground-, and Grass-type moves are rendered mostly useless by the fact that the Pokemon that carry them almost invariably run moves that beat Arceus-Bug. Arceus-Bug's offensive typing also leaves a lot to be desired, as Bug-type moves are resisted by a plethora of viable Pokemon in Ubers such as Ho-Oh, Xerneas, Primal Groudon, Giratina-O, Mega Salamence, and Dialga. Arceus-Bug is forced to rely on a Swords Dance set with the weak X-Scissor as its STAB move due to how easily Ho-Oh shuts down specially offensive sets, leaving Arceus-Bug quite lacking in power. This means that Arceus-Bug is a worthless Arceus forme that is completely outclassed by other Swords Dance Arceus formes that have greater overall power and offer far more to a team, such as Arceus, Arceus-Ground, and Arceus-Ghost. Do not use Arceus-Bug on a serious team.