Thank you for the reply, I've been getting mixed messages about Annihilape and I'm pleased to see an alternative perspective on the issue.
Still, I had some objections to raise about the observations presented.
110/80/90 looks like decent bulk in a vaccuum, but it doesn't play up due to a defensive typing that lacks useful resists. The immunities are actually bad for ape because it wants to take damage. Offensive Pokemon don't have problems 2HKOing it with neutral STAB moves, and it begins each game weak with 50 and 75 BP attacks.
It still has notable advantages. It punishes U-Turn and Rapid Spin, has a stealth rock resist, has full neutral coverage, and can and does terastalize when the defensive typing is an issue. If it runs into something it can't beat, it'll escape for later, bringing its boosts with it.
Most of the Unaware walls, even Clefable, also beat it easily.
Ferrothorn can pressure it because it will tend to not use Rage Fist on a Fightng-weak Pokemon with Iron Barbs, meaning Knock Off/Leech Seed forces it to Rest or use Drain Punch in desperation.
Even if Clefable preferred Unware over Magic Guard, it's out of the meta right now.
Dozo, Dirge, and Clod loses 1v1 against Taunt + Tera Water, unable to deal a heavy blow after Tera, and unable to curse, will-o-wisp, or recover, respectively, after taunt.
None are solid checks/counters. None will enjoy boosted rage fists.
Ferrothorn could inconvenience it with knock off against the leftovers it tends to rely on. But it's not winning 1v1 against the taunt-bulk up set either, not with damage mitigated from a +1 drain punch.
I know this, because I have used all of the above against Annihilape on ladder before. And At least 1 had to be sacked, every time.
I really have tried to explore responses to Annihilape. None are solid:
After a single rage fist boost, the Ghost-weak mons like Lele and Dragapult can't switch in.
Tornadus-T's Bleakwind or Hurricane is a gamble with that accuracy, and on Defensive Tera-Water or Fairy, is ~4hko after leftovers. Meaning it's boosted.
Pex is another L, on Rest sets Annihilape is happy to be tested on scald burns, and on Taunt sets it tends to kill or force out Pex on boosted Rage fist before a burn happens. In both cases, Water Tera means it does basically nothing.
Urshifu-RS to break through Bulk ups, once again, doesn't work on Tera-Water without prior damage (which tends to mean the Annihilape is boosted).
And even if it Tera-Waters, a Modest Specs Kyurem Freeze Dry can't kill from full.
You're welcome to call it noob killer as you like, but when combined with Cyclizar, it can and will punch holes in teams before you can force it out. Constant prediction is a necessity to avoid losing any mons in the process of fighting one.