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Slow Start and Truant are much worse because an Archeops doesn't have to wait five turns to have its speed stat or attack become normal (Slow Start) or has to be forced to skip every second turn (Truant). There's also healing items so that Defeatist is reset if the Archeops is healed to above 50% of its HP. Slacking and Reggigigas are screwed with their abilities unless it's a doubles battles with a Galarian Koffing that has Neutralizing Gas, or an ally uses Gasto Acid.