well, dig isn't a HM in Pokemon diamond, but it is an TM. anyway, you can find it on route 214, inside a cave where you'll find the ruin maniac- the same place where you find hippopotas.
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Dig is not a HM in Pokemon Platinum but a TM, it can be found in the ruin maniacs cave.
whirlpool is not classified as a HM in that Pokemon series, only in heartgold/soulsilver is it a HM, in diamond it is only a simple TM (1use)
The move Rock Tomb is a TM, not a HM.
get the HM strength, and teach it to a Pokemon
There is no HM Flash on Pokemon Diamond, I personally think its been replaced by HM05 Defog.