First update:
Named self Qwil (Qwilfish doesn't fit in), did stuff, chose Qwilfish as starter (using A-Starter), defeated Poochyena, named Qwilfish Spikester, did stuff, got to Rustboro, went to the gym, gosh, that gym was hard without Water Gun. I used a strategy comprising all my moves. Here it is: Firstly use Minimize 6 times so I don't get hurt much, set up 3 layers of Spikes so the next pokemon gets hurt, Poison Sting until it gets Poisoned (or gets Poisoned by Poison Point) and Tackle it until it faints. That strategy helped me defeat the gym. I defeated the Aqua grunt in Rusturf Tunnel and now am standing outside of Rusturf Tunnel.
Team:
Spikester/Qwilfish f.
Level 16
Poison Point
Lonely Nature
~ Spikes
~ Poison Sting
~ Tackle
~ Minimize.
Even if I used FRLG, I didn't had to worry about the evolution thingy because hey, Qwilfish doesn't evolve :P