Its more of a random thing, it is in a lot of different dungeons.
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yes, it dose learn focus punch in pokemon pearl.
The difference is that Focus Sash works when your Pokemon would have been KO'd in one hit from full HP, while Focus Band has a 10% chance of protecting your Pokemon from being KO'd from any HP.
You cant. You cant.
Focus sash is not an item in Firered. It will later appear in Diamond and Pearl.
You cannot find Focus Punch in Crystal. Focus Punch was introduced in Pokemon Ruby/ Sapphire. Focus punch is TM 1 in Ruby/Sapphire.