Emerald and Ruby - do I have a chance?

[Goldenboko]

Try and master your KOTR for Ruby. If it's not mastered then whoop Emerald (easier) and upgrade it. The number of stars your KOTR has is the number of times you get to use it on Ruby, for every mime materia you effectively own a duplicate KOTR. You only need to cast KOTR 6 or 7 times to defeat Ruby

Unneeded. Mime copies your last action, so you use KoTR once, mime it for the rest of the battle.
The action will work out like this.

KoTR
Mime (Mime's action before this)-> (Action before was) KoTR:Uses KoTR
Mime (Mime's action before this)-> (Action before was) Mime (Mime's action before this)-> (Action before was) KoTR: Uses KoTR
Mime (Mime's action before this)-> (Action before was) Mime (Mime's action before this)-> (Action before was) Mime (Mime's action before this)-> (Action before was)-> KoTR: uses KoTR.

And the it continues as such a mime getting added to the beginning of the equation for each time you use mime, therefore you don't even need to master KoTR just use your mime.