you can get all 3 starters for free as a mystery gift if you use the trading feature in pokemon home

Any starter from other regions can learn the ultimate move. I had my primarina learn it

You can get all three starters by trading

You can also fight the café guy to get a bit of exp and a possible sweet if you care about evolving alcremie. Once a day in each café, level varies.

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Just finished the game there so thought I'd check this out to see what needed done. A great list but your part about the steel beam is wrong.

Any steel type can learn it, not just Duraludon.