FI is honestly a bit of a trap on M-Gol. Its far better off running SD to break defensive teams and even contribute more comfortably vs offense, since both Sucker Punch and Aqua Jet can be used multiple turns in a row and have better typings to pressure opposing pokemon. FI also often comes up short vs stuff and late game it not being spammable is pretty unfortunate.
Moving away from Samurott for a minute, Magcargo mentioned terrains in their post and there's one pokemon that I feel was already very strong in the past format yet ladder seemed to never want to use despite being strong, but has only gotten better in this newest format. And that would be...
Metagross-Mega @ Metagrossite
Ability: Tough Claws
Level: 50
EVs: 32 Atk / 2 SpD / 32 Spe
Jolly Nature
- Psychic Fangs / Ice Punch
- Meteor Mash / Bullet Punch
- Earthquake / Body Press
- Thunder Punch
Mega Meta was always strong but somehow passed over by ladder (cough ladder please stop spamming base Scizor it's not very good cough), but it had offensive counterplay in common priority like Shadow Sneak and Sucker Punch as well as Earthquakes from pokemon it may fall just short of KOing in one go. However a big addition in this format is that of the return of terrains. Specifically, Rillaboom and Indeedee. The former is huge in not only providing it passive recovery via GTerrain, but also cutting EQ damage against it in half. The recovery is particularly big in mitigating passive damage it may take from Spikes or Helmets when brawling and going in and out of battle. Psychic Terrain meanwhile completely shuts off the priority of these slower pokemon that might threaten it (Ceruledge, Kingambit, Samurott-H) and allows it to more freely spam attacks. A Hamurott cannot switch into a Psychic Terrain supported Mega Metagross really as it will not be able to chase it out with the threat of Sucker Punch, Ceruledge is dropped by Psychic Terrain Psychic Fangs after spikes, and Kingambit fears fighting coverage. Which also brings me to a thought.
I don't think you really need Earthquake. Outside Aegislash, the move doesn't really cover anything that fighting moves cannot. Aegislash is great of course, but it's also not that hard to prep for due to the nature of Poltergeist's limitations and it's easier to simply build with a partner for Mega Meta to fall back on, and loading up a fighting move lets it freely beat down other mons. In particular Body Press is a great move on it that smashes Kingambit lacking Chople Berry, Samurott-H, Meowscarada, Hydreigon, and in general it's a fairly fine move to throw out to punish would be switch ins of these mons, as it still does quite fine damage thanks to Tough Claws and Meta's high defense stat.
This to me, is a mon to watch in this format (it already was last format but yknow), and once the metagame develops more and if we see the ban of brokens (cough sam cough) it only stands to get even better. It still farms bulky teams like almost nothing else does, and the terrains give it the ability to smack down with offense more easily.
Hatterene (F) @ Kebia Berry
Ability: Magic Bounce
Level: 50
EVs: 32 HP / 26 Def / 8 Spe
Bold Nature
- Nuzzle
- Psychic Noise
- Draining Kiss
- Healing Wish
I lied there's more.
Hate Glimmora leads and want to deny their hazards near guaranteed (and still block other hazards from Garchomp and such)? It still mostly functions in its role I find. Just be sure to pack a partner special attacker or a grounded poison, not that either is hard to do I think. Also has the benefit of messing with its usual would be switchins via Nuzzle and Psychic Noise.
Chesnaught @ Rocky Helmet
Ability: Bulletproof
Level: 50
EVs: 32 HP / 29 Def / 5 Spe
Impish Nature
- Spikes / Knock Off
- Body Press
- Iron Defense / Wood Hammer / Knock Off
- Synthesis
SUPER underrated physical wall right now. Awesome into Kingambit, Samurott-H, Mega Lopunny (still very cracked btw), Mega Scizor, Cinderace, Excadrill, Meowscarada, Mega Swampert, and even able to act as a solid back up check to Mega Raichu-Y thanks to being immune to Zap Cannon and blanking Focus Blast as well, only vulnerable to Alluring Voice variants. You can even speed creep Mega Golisopod and run Iron Defense to effectively check it as well, should you desire. Rocky Helmet is the big focus here though, as it punishes all these physical attackers with chip, and its capacity to lay out Spikes while doing so is very valuable for teams in wearing their opponent's down. Oh and this set also bullies non Brave Bird Corv which I find quite funny.
Super neat pokemon that I recommend giving a go.