there is no rock smash in Pokemon Red. there are only 5 HM's in Red version. the rock smash was introduced in the Silver and Gold versions.
It is on shinou city,it is at front gate pokemon leage the nugget. HOPE IT HELP GOOD LUCK
go to pallet town and talk to your rivals sister and she will give it to you
You use it
yes
you cannot rent any Pokemon in red version
rock smash isn't in Pokemon red version
No
You can't, you can only do that on Pokemon yellow version
Red version was not made to migrate with emerald.
No!
You get it at Ember Spa in the sevii islands
rocksmash in cinawood