I only used 2 online walkthroughs for Pokemon FireRed to power through it so I could trade Kanto Pokemon, the Legendary Birds and Dogs, and Mewtwo to my Sapphire/Emerald carts.
Only other games I've needed one for are Rocket: Robot on Wheels (N64; I LOVE that game!) and Legend of Zelda: A Link to the Past (some areas are so convoluted, but it's still an awesome game).
Otherwise, I just use FAQs for advanced Pokemon concepts like IVs, EVs, advanced breeding, etc. (and tips & tricks for other games...darn you One Piece for GBA! :cer_pissed:) But the Pokemon games are pretty easy in general (I'm just worried about how I'm going to face Platinum's Distortion World and post-game content...hope I don't get lost! :nervous:)
Personally, I like beating games without walkthroughs & FAQs, as it gives you a greater sense of accomplishment and shows that you're skilled enough to beat the game (and find hidden content?) without assistance. :)
But the downside is that without walkthroughs & FAQs, you might miss out on a hidden item/event or misuse a certain item properly (i.e., using Master Ball on a non-roaming or non-Shiny Explosion-using Pokemon. Personally, though it is harder, I like to use Master Balls on all large legendary Pokemon {Groudon, Lugia, Dialga, Heatran-size Pokrmon, etc.} and catch roamers with other types of Poke Balls.)
Lol, I remember when I used to think in elementary school that the RSE guides were THE authority on Pokemon. Then I learned about Bulbapedia, Serebii, Marriland, Veekun's Chain-Breeding Calculator, and Smogon, etc. How times have changed. :D