Breakfast Party:

Leo happily stuffs his face while the conversation flows. Eventually he’s eaten his fill and returns outside to keep watch.

((I’ll just let you lot interact for a bit. Yell if you need me.))

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Mark:

There’s a Move Tutor at Trainer Hill, but I don’t think Surf is one of the moves he can teach,” the Ranger replies in his usual drawl. ((Strictly speaking he can, since as of Gen VIII it got added to the level up move lists of a number of Pokémon, but the existing party Pokémon either aren’t one of those or aren’t high enough level yet.)) “We used to have the HM at the Ranger Base in Stardust City, but we lost it when the city fell. I don’t recommend going after it; even if Bandra hasn’t found it yet Stardust is going to be a much harder target than what you already have planned.

If I were you I’d just ask around; someone might have one they’ll let you borrow. Or just schedule your water travel around the peak of high tide, but with what you’re trying to do that’s going to be riskier.