I CANT DO THIS!!!

If you seriously can't beat that, I suggest you train cause those later dungeons like Magma Cavern and Sky Tower will KILL YOU. I'm telling you don't just go up the stairs the second you get there. Just stay behind for a little while and kill as many enemies as you can. You will have to bring a lot of Apples and Max Elixirs though.

It's alright that you can't beat that dungeon. go to your menu and click moves switch over to your friends moves and the ones with star's by them are the ones they will use. if he has teleport, sweet scent, or something that they use very often switch them off because they will make you mad a lot. Expecially the teleport because whenever he sees a pokemon close or something they have a tendency to teleport so go to the move and if it has a star by it click switch so that it doesn't and he will not use that move again. There is also no easy way to get past dungeons if your by yourself like later in the game i carry a warp scarf because it teleports me into different rooms until i see the room with the stairs then i take it off, go down the stairs, and continue this patterns. it really works for big dungeons like stormy sea, buried relic, or the one where you get mewtwo.