How do I defeat Rayquaza in Pokemon Red Rescue Team with a Cyndaquil and a Chikorita?

I'm trying to defeat Rayquaza in red rescue team with a Cyndaquil as a starter and Chikorita as a partner. I saved at the checkpoint already. Most people are probably just going to say to use Smokescreen. I already know that. I am level 29 and my partner is level 28. My Cyndaquil knows Smokescreen, Flamethrower, Hidden Power, and Flame Wheel. My partner, Chikorita, knows PoisonPowder, Tackle (Linked with PoisonPowder), Razor Leaf, and Synthesis. Normally I would use a link box and link all 4 of my moves together on a boss, but I don't have a link box. I would appreciate any help. Thanks.