>>29635891>spending $350 on games for pussyebin
You want reliable moves for the most part, so high accuracy, decent power, and few to no drawbacks are typically best. Something like Scald (new water move with 100% accuracy, 80 power, and a 30% chance to inflict burn) or Surf is usually far more useful than Hydro Pump, which is less reliable because of the mediocre accuracy, even if it is more powerful. Same goes for Hyper Beam, very few Pokemon use it effectively because the recharge turn means that, even if you KO the opponent, they have a free turn to boost their stats and sweep you.
On that note, you probably never used stat moves as a kid, but you might want to look into them. I.e, Swords Dance effectively doubles your attack power after using it once, Thunder Wave inflicts paralysis, which halves the opponents speed and can let your slower Pokemon move first, etc.
Don't worry about EVs and IVs and shit for now. You might want to catch Pokemon of a certain nature (since that affects stat growth), but don't let it disrupt your first playthrough's immersion. Just have fun.