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Considers Quiet perfectly fine. Was never going to be quick as Primarina. Winds up being its lowest stat. Shares the same base Speed (once fully evolved) as Wailord, Pichu, Spoink, and several others.
Quiet is fine. Can be even better than Modest to give it slightly more physical damage if you want to give it a move like Aqua Jet of Flip Turn, or if you have other slow Pokémon on your team to play with Trick Room strats. Speed is its worst stat already anyway.