You barely even need HMs in this game. But I guess you could stick Surf, Waterfall, Dive, and Fly on a Swanna. Surf is probably the one you'll need the most to reach things in general, and you can catch a Ducklett/Swanna on either of the bridges where feather shadows appear.
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They've covered the best ones, but if ya' need to get through Abyssal Ruins, Golduck's got you, and he's easily obtainable after you get the National Dex. Flash, Surf, Waterfall, Dive. Just get a pokemon who knows Strength, Cut, and fly, and you're set for your two HM slaves.
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