Will level 73 Rayquaza one-shot a level 70 Groudon with waterfall?

It has 242 Special Attack. I don’t know its IVs, but I’m assuming they’re as high as possible because I don’t want to kill Groudon. My Rayquaza has a Serious nature. It used Ancient Power once. I’m assuming Groudon has no IVs, nor EVs, as I’m being careful. It has about 90% of its health left, so take that into consideration. I want to catch it, so one-shotting it isn’t an option. I do have a Master Ball, but I’m saving it for either Kyogre or one of the Regis.

Pleaselog inorregisterto add a comment.

Groudon with 0 SpD IVs, -SpD nature:252 SpA Rayquaza Waterfall vs. 0 HP / 0- SpD Groudon: 277-326 (81.2 - 95.6%) – guaranteed 2HKO

Groudon with 0 SpD IVs, neutral nature:252 SpA Rayquaza Waterfall vs. 0 HP / 0 SpD Groudon: 248-292 (72.7 - 85.6%) – guaranteed 2HKO

Source

I’m assuming you’re in Gen 3, since you gave your SpA EVs. If Rayquaza didn’t have Air Lock, Drought would weaken Waterfall enough to safely use it. But since Air Lock negates that, you do run the risk of getting either a high damage roll against the absolute lowest SpD Groudon can have (unlikely) or critting (much more likely, at 6.25%), both of which will be enough to KO after the Ancient Power you already used. Both are pretty unlikely, but if for some reason you cannot afford to lose this Groudon (like if you forgot to tell us that it’s a shiny or something), then be aware that there is a risk.Assuming, of course, that you kept you haven’t continued the battle in the 10 hours it took for you to get an answer, which I suppose is rather unlikely.

sourceRayquaza was level 73, and Groudon was level 70. Groudon had minimum IVs and a -special defense nature. Rayquaza had 26 special attack IVs and 0 EVs to have exactly 242 special attack, and then I gave it a +special attack nature to simulate the badge boost.