@Sven: Sorry I'm late. When you get the games, assuming you have both the consoles you're debating on playing them with, just pop them in and see what you prefer. A GBA would definitely be better for GSC though. For RBY, it's not really a big deal. Everything will just be red or blue in RB and in Yellow, every route and city are a different color. And the Pokemon are usually colored in with one color. Nothing to look twice at.
@Fikri: There isn't really a trick to it, but I strongly recommend leading with a good Ground type or a good physical attacker with a Ground attack, like maybe Donphan or Dugtrio. tbh though, if you want help with this, try checking out the in-game team help forum in Battle Center. You can make a thread and post your whole team there and people will give you advice on anything that may need changing. Remember to post movesets when you do that.