No, Transform works like that:
If you are a Metronome Chansey holding Eviolite or Lucky Punch and get Transform, you'll not only get the enemy transform with base 250 HP, but you also either get defensive boosts or a much higher crit-chance
I know where you confusion might come from, as why doesn't Ditto's specific powders doesn't work? It is because Gamefreak is trollin, that's why.
So a Chansey transforming into Golbat gets an Eviolite boost, a Ditto doesn't
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I myself have a queston about Ppokemon Mystery Dungeon, espeically about PMD Darkness/Time: What is a good mon for South island cjhallenge? I honestly thought Nincada with Compound Eyes and Fury Swipes should be wrecking, but someone might have a much better tip.