Do moves targeting the whole field deal reduced damage from spread if they target an ally and one opponent?

Question

I know moves targeting 2 opponents have their power reduced by 25% (for instance a dazzling gleam against two targets would have a base power of 60 not 80), but hits with full power when targeting a single opponent.

My question is as follows: does this reduction apply if a move targets 2 opponents on opposite sides of the field?

So for example if I'm in a doubles match and my opponent only has one Pokemon but I have two, if I use earthquake, will its base power be 100 or 75 because the damage is spread over my ally?

Comments

I don’t know competitive but I would imagine it would deal 75 instead of 100 just because it’s in a doubles

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But if you had both KOed 5 each in a 6v6, it would deal 100%. The reduction is based on whether the move is selected to hit more than 1 Pokemon, and then that all of them are present to be hit.
I Just put this here because, from your wording, it sounded like "all spread moves used in doubles deal 75%"

Answer 1

Yes, it will be reduced.

In Generation III, if there is more than one target, moves that can hit both foes (but not moves that hit all Pokémon on the field, such as Earthquake) have their damage reduced by 50%. In subsequent games, if there is more than one target, any move that can hit multiple Pokémon has its damage reduced by 25%.

Source

Note that it does not say opponent, only target. It will also be a 50% reduction in Generation 3, if you are playing that, as opposed to any later Generation.

Comments

I can confirm. Whenever there are multiple targets, the move power is reduced. Nothing else about the targets matters, as long as there are multiple.

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You should mention that this isn't true in Generation III.
"In Generation III, if there is more than one target, moves that can hit both foes (but not moves that hit all Pokémon on the field, such as Earthquake) have their damage reduced by 50%."