I had no concept of types/what good moves for a pokemon were. As such, my Sceptile in my first play through of Ruby knew Cut, Rock Smash, Flash, and False Swipe... I only trained my sceptile, and my second best pokemon was a Lv 30 Azumarill. When I got to the 7th gym, I used Cut and Ice Beam on Lunatone and Solrock thinking "WHY WONT YOU DIE!"
I had no concept of the PC system, and so I couldn't switch my party pokemon for a while. I kept thinking that it wasn't nice to access someone else's computer...
The very first time I played Ruby, I got to the first route and thought "I can't catch pokemon, there must be something wrong" before I had any pokeballs. I restarted the game after that.