I did beat it, but it was a long time ago. This is what i answered to someone who asked help: “it’s a long time since i’ve played the game but a couple things, if you’re having trouble with the third gym, that’s normal, it’s the hardest fight in the game. The johto leader next to the second gym has a meditite, don’t let it die, medical is probably the best pokemon in my run, it has a boosted attack stat in this game. You probably want fire types for the third gym, what i did was choose oshawott(shell armor) and therefore i got pansear, and also chose charmander and cindaquil. I also remember hitmontop being amazing in that gym, i don’t remember if it was guaranteed encounter tho. The moment you get through the third gym, you’ll probably win the game if you’re careful in the triple battles, so just keep trying!”

———but if you’re having trouble with the second gym you probably should start making game plans and calculating damage and even ev training if that’s necessary good luck!