Kabutops' Base Attack is 115, which means a Level 100 Kabutops with a 31 Attack IV will have an Attack stat of
292. Next, add 200 AVs to this and it's Attack Stat is
492. Now, give it, say, an Adamant Nature and it's Attack Stat becomes
521. Finally, max out it's Attack Stat with Swords Dance, and it's Attack Stat becomes
Kabutop's Attack cannot raise any Higher without Held Items or Abilities, which are not present in Let's Go PikachuTM or Lets Go EeveeTM, therefore Kabutops' max unboosted Attack is 521, and boosted is 2084.
Source, Experience :P
Hope I Helped!