Exactly which is why I'm saying it's all mixed up.
I don't really feel that's the case. The manga scan says that Kotesu thinks he's already lost after Samurott and Swanna get take down by Pikachu (he likely thinks its a 3 on 3) so Hydreigon being a secret weapon and all is likely his last/second to last Pokemon used
Snowflakes in a Fire image? Don't question Pokemon logic