First, you battled Sudowoodo and then go right and talk to the fat man and he will give you rock smash
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It's the same with heartgold and soulsilver. Theres a fat boy near the enterance of the ruins of alph talk to him and he should give you HM Rock smash
Hiker on route 36
go to ruins of alph and use rock smash on every rock to find it
You use rock smash and can sometimes find fossils.
In Pokémon HeartGold, you can find the Rock Smash HM in Route 36, a fat guy will give it to you.yes. but flash in no longer an HM