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yes, it CAN be defeated in 3 moves if you only are able to use very strong super effective attacks on it, but lets face it it will basically mean that it will be impossible to defeat while it is eternamax with the best you can do is switch into NVE or uneffected by poison, dragon, or fire attacks (or ghost or grass or steel).
it is basically shuckle with the HP of chancey, so it wont be going down, and although 115/125 offenses are good, it can be... oh wait, it gets agility as well as dragon dance but not a good attack movepool to do shit with but it has a base speed of freaking 130 anyway. with 1 agility or DD set up, the best you can do is to just tank the 3 special hits and even if it doesnt kill you
252 Atk Choice Band Strong Jaw Dracovish Fishious Rend (170 BP) vs. 0 HP / 0- Def Eternatus-Eternamax in Rain: 178-210 (30.1 - 35.5%) -- 29.2% chance to 3HKO
252+ Atk Choice Band Strong Jaw Dracovish Fishious Rend (170 BP) vs. 252 HP / 252+ Def Eternatus-Eternamax in Rain: 144-169 (22 - 25.8%) -- 2.9% chance to 4HKO
note that Eternatus has 0IV and 0EV in speed