>>56743945Maybe not.
Remember, it has 150 Atk and can’t be burned due to Water Bubble.
Assuming it has similar movepool to Regieleki
You still are dealing enough damage to Seismitoad to 3HKO it with Body Slam or Take Down,
252+ Atk Choice Band Deoxys Body Slam vs. 248 HP / 252+ Def Seismitoad: 147-173 (35.5 - 41.8%) -- 86.9% chance to 3HKO after Leftovers recovery
252+ Atk Choice Band Deoxys Take Down vs. 248 HP / 252+ Def Seismitoad: 155-183 (37.5 - 44.3%) -- guaranteed 3HKO after Leftovers recovery
Add spikes and what can you even do defensively against it?