How To Beat Red In Soul Silver?

Beat the elite four the second time around, then just keep battling the elite four, until your pokemon are at lvl: 60-90 (depending on what pokemon you have and how good you are in battles) DON'T train up to lvl 100 or use cheats, because this makes the game boring.
Then you should talk to oak and he will give you the kanto starters.

Buy tons of items if you have a good team and patience you can beat red around level 60.

Get some good level 100 pokemon and go up to the top of mt silver his snorlax is the best

Get lots of items and train pokemon to around level 70 and give it items that boost there power

Train

With:
Steelix
Magnezone
Lucario
Crobat
Probopass/Aggron/Bastiodon
Lanturn
all level 65 at least

Get weezing and raise his speed and defense and sp defense then make him learn destiny bond and explosion

Use cheats

Use action replay cheats and get lv 100 pokemon