The second round of the elite 4 is meant to be a challenge, how much harder is round one than round 2 is on your first go?
What are your pokemon and levels?
You can actually do this with Level 60 Pokemon but prior training is almost necessary. You aren't going to be able to beat them without continually training against them if you aren't powerful enough.
If you don't want to do all the levelling required bring an almost unlimited supply of healing items.
If you want to be able to beat Red afterwards you will need more training on top of that, but that battle can be accomplished with Level 65+ Pokemon.