I mostly replayed the game to test Venusaur and Marowak and I gotta say, one I liked very much and the other one not so much.
Hawlucha (ingame-trade): Arguably the highest tiered Pokémon up until Generation 7. Comes early, has a good nature and IVS, does not need support, learns good attacks, has favorable type matchups right away and until the end and gains tons of bonus experience to keep overleved at all times. If anything, we may need a tier beyond S-tier because its performance is way beyond Mudsdale. It naturally learns Endeavor which if coupled with the free Focus Sash later on means you can Endeavor Ultra-Necrozma, get your Unburden speed boost and then KO it hilariously easy.
Mudsdale: Stamina allows it to stall pretty much every physical attacker which doesn’t hit for super effective damage and the ground type is generally very useful in Alola. The early 95 BP move certainly helps as well. The only downside is the speed, but since lots of your enemies are either frail or also very slow, the issue isn’t as relevant as it would be in previous titles. The Quick Claw I got early on helped it more than any other item did. Random priority was appreciated and happened a lot more than I anticipated. It learns all the moves it wants by itself with the only exception being Rock Slide which you get soon enough to keep up with the increasing power of enemies. If you ever need to heal, you likely got so many Stamina boosts that you don't need to heal ever again during the same battle. Its S-tier status is unquestionable.
Primarina: The lack of early Scald compared to the original Sun and Moon was a very big minus since its water type is the only relevant one until very late into the game after you get Moonblast and your secondary typing. Overall, its first two stages perform average with the only major event being able to beat Kiawe with Z-Water Pledge easily. Although I required the Soothe Bell from Route 3 to reach the happiness and a detour to be able to get the move. I’m not quite sure if it ended up being worth it instead of just using Bubble Beam. Until fully evolved, its only benefit to me was it being a somewhat bulky water type, nothing more. The good experience group at least meant that it kept along with the average level of my team, even though I rarely used. It suddenly turned really good once it fully evolved. It attains a quite wide special moveset, one that is good enough to make it a suitable user for Expert Belt outside of boss battles. When fully evolved, it did two-hit pretty much anything and took hits pretty well so healing was very manageable and not excessive at all. The extra-strong Z-move is a nice plus. It feels more like a B-tier to me as the first two stages were too much of a letdown.
Venusaur: The scan feature makes is very easy to find fast and it’s as early as Route 2. It felt like a better version of Primarina early because Grassy Terrain enabled it to heal and boost itself right away. While I eventually dropped Grassy Terrain I kept Sleep Powder all until the end because it remained a useful asset for pretty much all neutral matchups. It paired especially well with Giga Drain which can be picked up right after your first Mantine Surf and is an absolute must for it to remain relevant. It’s surprisingly good speed for being a bulky Pokémon coupled with Giga Drain and Sleep really made it a fun and very consistent pick in the end. While it takes a while to get access to Venoshock and later Sludge Bomb, the coverage wasn’t actually as important as I initially assumed. A very fun gimmick was the ability to pick up Nature Power on Route 5 and equip the Normalium-Z in order to patch up its type coverage with moves depending on the environment which can also be turned into a variety of Z-Moves. This means you can use a 175 BP Bloom Doom using Grassy Terrain or in any grassy environments (pretty much all routes) before you even attain the grass crystal. I didn’t always take advantage of this, only for a couple super effective grass, normal, rock, water and ground Z-Moves but it may be good enough of a gimmick to be further investigated. The early final evolution was appreciated as well and I definitely think it should be considered an average entry in the A-tier as I didn’t have any problems or unexpected KO’s with it at all.
Alolan Marowak: I played Ultra Moon so I was only able to catch a Cubone, steal Kiawe’s Thick Club and use one that way. The Cubone phase was kind of average, it required lots of healing but STAB Bonemerang helped it a lot. The lack of a ghost STAB until the Pokémon League using the Move Relearner was a pretty huge letdown because its fully evolved typing is kind of good offensively but very poor defensively. You barely get any benefit from your ghost typing as the AI isn't as stupid as to try to spam normal moves on you. You absolutely need to learn Fire Punch via Tutor to get a strong fire STAB because Flare Blitz comes late and is unviable as Marowak cannot afford to sacrifice its own HP with its bad bulk and speed. In the end, Marowak was the least used member of my team by far because it may have had the power to one-shot a lot of enemies, but it had trouble switching in when it counts and was fainted a lot due to its poor HP and very low speed, even for Alolan standards. I rarely required fire coverage as well. Mine had Cursed Body, but I would strongly advice everyone to consider hunting for one that gets Lightning Rod later if you can as an electric immunity would have been very useful for quite a few matchups and free switch-ins. Cursed Body never helped me at all. I’d rather put it in low B-tier. A-tier feels very unjustified because it may be good with some speed setup (X-Speed or one or two Flame Charges), but you really don’t want to set up on every other fight, especially on games as slow as USUM. I cannot speak for the totem variant, but I highly doubt it is S-tier material although I agree with later posts below that Rock Head, no babying and Shadow Bone early is a nice plus.
Magnezone: Its only downsides are that it remains Magnemite for too long and has to wait for its high BP attacks. It’s typing comes in handy offensively and especially defensively literally everywhere. It takes a while to learn high BP attacks, so upgrading Thunder Shock to Shockwave and adding Signal Beam to not only resist but also counter psychic types using the Beach Tutor felt very necessary. Mine evolved right before the Power Plant, so I skipped straight to Magnezone when I arrived there. It ended up making great use of the free Choice Specs I got at the Tapu Village later and kept that item until the very end as resisting attacks and spamming its STAB moves worked against most opponents, strategies beyond that seemed very unnecessary. The sheer amount of enemies that lack any good coverage moves to be able to damage Magnezone was very surprising. Its current spot in the A-tier feels very justified in the end.

Hawlucha (ingame-trade): Arguably the highest tiered Pokémon up until Generation 7. Comes early, has a good nature and IVS, does not need support, learns good attacks, has favorable type matchups right away and until the end and gains tons of bonus experience to keep overleved at all times. If anything, we may need a tier beyond S-tier because its performance is way beyond Mudsdale. It naturally learns Endeavor which if coupled with the free Focus Sash later on means you can Endeavor Ultra-Necrozma, get your Unburden speed boost and then KO it hilariously easy.

Mudsdale: Stamina allows it to stall pretty much every physical attacker which doesn’t hit for super effective damage and the ground type is generally very useful in Alola. The early 95 BP move certainly helps as well. The only downside is the speed, but since lots of your enemies are either frail or also very slow, the issue isn’t as relevant as it would be in previous titles. The Quick Claw I got early on helped it more than any other item did. Random priority was appreciated and happened a lot more than I anticipated. It learns all the moves it wants by itself with the only exception being Rock Slide which you get soon enough to keep up with the increasing power of enemies. If you ever need to heal, you likely got so many Stamina boosts that you don't need to heal ever again during the same battle. Its S-tier status is unquestionable.

Primarina: The lack of early Scald compared to the original Sun and Moon was a very big minus since its water type is the only relevant one until very late into the game after you get Moonblast and your secondary typing. Overall, its first two stages perform average with the only major event being able to beat Kiawe with Z-Water Pledge easily. Although I required the Soothe Bell from Route 3 to reach the happiness and a detour to be able to get the move. I’m not quite sure if it ended up being worth it instead of just using Bubble Beam. Until fully evolved, its only benefit to me was it being a somewhat bulky water type, nothing more. The good experience group at least meant that it kept along with the average level of my team, even though I rarely used. It suddenly turned really good once it fully evolved. It attains a quite wide special moveset, one that is good enough to make it a suitable user for Expert Belt outside of boss battles. When fully evolved, it did two-hit pretty much anything and took hits pretty well so healing was very manageable and not excessive at all. The extra-strong Z-move is a nice plus. It feels more like a B-tier to me as the first two stages were too much of a letdown.

Venusaur: The scan feature makes is very easy to find fast and it’s as early as Route 2. It felt like a better version of Primarina early because Grassy Terrain enabled it to heal and boost itself right away. While I eventually dropped Grassy Terrain I kept Sleep Powder all until the end because it remained a useful asset for pretty much all neutral matchups. It paired especially well with Giga Drain which can be picked up right after your first Mantine Surf and is an absolute must for it to remain relevant. It’s surprisingly good speed for being a bulky Pokémon coupled with Giga Drain and Sleep really made it a fun and very consistent pick in the end. While it takes a while to get access to Venoshock and later Sludge Bomb, the coverage wasn’t actually as important as I initially assumed. A very fun gimmick was the ability to pick up Nature Power on Route 5 and equip the Normalium-Z in order to patch up its type coverage with moves depending on the environment which can also be turned into a variety of Z-Moves. This means you can use a 175 BP Bloom Doom using Grassy Terrain or in any grassy environments (pretty much all routes) before you even attain the grass crystal. I didn’t always take advantage of this, only for a couple super effective grass, normal, rock, water and ground Z-Moves but it may be good enough of a gimmick to be further investigated. The early final evolution was appreciated as well and I definitely think it should be considered an average entry in the A-tier as I didn’t have any problems or unexpected KO’s with it at all.

Alolan Marowak: I played Ultra Moon so I was only able to catch a Cubone, steal Kiawe’s Thick Club and use one that way. The Cubone phase was kind of average, it required lots of healing but STAB Bonemerang helped it a lot. The lack of a ghost STAB until the Pokémon League using the Move Relearner was a pretty huge letdown because its fully evolved typing is kind of good offensively but very poor defensively. You barely get any benefit from your ghost typing as the AI isn't as stupid as to try to spam normal moves on you. You absolutely need to learn Fire Punch via Tutor to get a strong fire STAB because Flare Blitz comes late and is unviable as Marowak cannot afford to sacrifice its own HP with its bad bulk and speed. In the end, Marowak was the least used member of my team by far because it may have had the power to one-shot a lot of enemies, but it had trouble switching in when it counts and was fainted a lot due to its poor HP and very low speed, even for Alolan standards. I rarely required fire coverage as well. Mine had Cursed Body, but I would strongly advice everyone to consider hunting for one that gets Lightning Rod later if you can as an electric immunity would have been very useful for quite a few matchups and free switch-ins. Cursed Body never helped me at all. I’d rather put it in low B-tier. A-tier feels very unjustified because it may be good with some speed setup (X-Speed or one or two Flame Charges), but you really don’t want to set up on every other fight, especially on games as slow as USUM. I cannot speak for the totem variant, but I highly doubt it is S-tier material although I agree with later posts below that Rock Head, no babying and Shadow Bone early is a nice plus.

Magnezone: Its only downsides are that it remains Magnemite for too long and has to wait for its high BP attacks. It’s typing comes in handy offensively and especially defensively literally everywhere. It takes a while to learn high BP attacks, so upgrading Thunder Shock to Shockwave and adding Signal Beam to not only resist but also counter psychic types using the Beach Tutor felt very necessary. Mine evolved right before the Power Plant, so I skipped straight to Magnezone when I arrived there. It ended up making great use of the free Choice Specs I got at the Tapu Village later and kept that item until the very end as resisting attacks and spamming its STAB moves worked against most opponents, strategies beyond that seemed very unnecessary. The sheer amount of enemies that lack any good coverage moves to be able to damage Magnezone was very surprising. Its current spot in the A-tier feels very justified in the end.
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