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!
A modified version of Pokemon Red.
No
Yes.
You can't get to Four Island in Pokemon Red Version.
Emerald can trade with Leaf Green but not Pokemon Red
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.