Can a berry "weaken" an OHKO move?

Question

For instance, a Pokemon holds a Yache Berry, and an opponent uses Sheer Cold on it. Obviously it will still OHKO, but will the berry weakening damage message still show?

Answer 1

No, those berries are only checked during the damage formula, which OHKO moves never call: they simply set the damage to 65535 and fire away.

Comments

How do you know that? Do you have a source?

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This is something that's easy to verify in-game yourself, either by using Trick to give a type-resist berry to a weak wild Pokemon (if they're at least 70 levels lower than you, your move will have 100% accuracy), or by attacking your own teammate, who you've specifically set up with the berry, in a double battle.

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Good enough.