Someone please correct me if I'm wrong, but I suspect Colo/XD use the same AI as Ruby/Sapphire, where even 'smart' doubles opponents choose their target at random and then choose their move using smart AI. It can feel really silly at times, but the added randomness can sometimes catch you off guard.
Notably, this makes Tate & Liza a common run-ender in RS speedruns, because you want Solrock and Lunatone to just spam Psychic on your low-level Pokemon while you set up Swampert, but if they randomly 'target' Swampert then they might see one of their utility moves (Calm Mind, Light Screen, Hypnosis, Sunny Day) as the best option instead, which makes the battle much slower, if not an outright loss.
EDIT: I misremembered exactly how the T&L fight works: ideally you want your Swampert to be at low enough HP that Lunatone sees a KO with Psychic, but not so low that Solrock sees a KO with Psychic. If you have the right HP, you can continually use your low-level Pokemon's turn to heal Swampert out of KO range while hopefully being juust knocked back into it, preventing Lunatone from ever having a reason to use Light Screen, Calm Mind, or Hypnosis.
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