Unfortunately, it’s been a long time since I last played, so I couldn’t tell you the exact strategy, but I’d say a Beedrill with Fell Stinger, Poison Tail, or First Impression could help you. I think you can get them in the first few towns.
After so many tries, i finally made it, i used beedrill like you said, thank you, that was he only way.
AND: your game is so good, if the nintendo doesnt made so much trouble, you could sell it for sure
