Go to pecifilog (the town closest to sky pillar) and in the pokecenter there is a person in one of the corners (I think the bottom left) and they will tech on of your Pokemon expolsion once and only once. You can also get some Pokemon that learn explosion/self-destruct via leveling up or move tutor, hope I helped
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By moving clumps of grass in pokemon emerald.
You can't its not a move in emerald.
A HM is a move is a move that can be tought to as many Pokemon as you like but the Pokemon has to be able.
Some Pokemon learn this move like marowak and scyther.
The best normal type move for pokemon is explosion. ;-)