After you beat all 8 Jhoto and all 8 kanto gym leaders and beat Prof. Oak will give it to you as a gift so you can climb to the summit of Mt Silver to Vs Trainer Red (Ash)
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If HM8 is Rock climb, You have to beat blue (gary Oak) then talk to Prof oak and he give you it. Blue is the 16th Gym leader
yes it is in the ice cave.
how to get Dive HM8
Oops! there is a HM8 in PLG it's 'waterfall' sorry! :)
There is no best Pokemon on Pokemon HeartGold.