Recently I've been playing through Sapphire again and using Treecko as my starter... It's so good! It kills everything that the rest of my team can't handle with its Leaf Blade. The only criticism I have is that it doesn't have a great move pool. :3 I bring this up as it seems we don't currently have a topic being followed, so here's a new one! ^^
New topic: Which Grass starter do you find most useful in-game?