First of all, only Pikachu has a good Nature - all the other natures are terrible, and if you wish to succeed competitively, you'll need to re-breed the vast majority of your team. To see which Natures will benefit you most, this table here should do the job:
http://www.pokecharms.com/forums/index.php?topic=4070.0
Now...
- Typhlosion will want mostly Special Attacks since his Base Sp.Attack is higher than his Base Attack. However, his Special movepool is, well, terrible, so that isn't really much of an option for the most part. Fire Blast is preferred over Flamethrower for the extra power it provides, and the Reversal/Endure combo works wonders for filling in the gaps in Typhlosion's moveset. The fourth move is essentially filler since Typhlosion has so few options...anyone caught recommending another Fire-type attack in the fourth slot will be fed to a Locust Berserker.
- Leafeon should focus on Attack and Defense, and to some extent, Speed. Leaf Blade is the best attack for Leafeon to carry, packing good power and running off the superior offensive stat. Swords Dance will be of more use than Sunny Day will to help in that area, and Aerial Ace and X-Scissor can provide (some) coverage. Quick Attack can work to bypass Leafeon's average Speed stat, although the somewhat lacking power can be a bit suspect.
- Pikachu NEEDS Light Ball for the hold item - I'm sure that speaks for itself. Thunderbolt is the main STAB of choice, and Substitute is usually necessary to avoid being murdered - Pikachu gets OHKO'd by literally everything. Focus Punch + Substitute works very well to allow Pikachu to damage most threats, and Grass Knot/Surf is optimal for taking out Ground-types - Grass Knot actually works best here since it also fells Swampert, which Surf may not be able to OHKO.
- Glaceon with a Choice Scarf is the biggest menace to Dragon-types ever. Ice Beam for STAB obviously, since you can't set up Hail with the Scarf on. Unfortunately Glaceon lacks any real moves to help with coverage - Shadow Ball, Signal Beam, Water Pulse and Hidden Power Electric/Fighting/Fire are really the only other options. Luckily for Glaceon, that Ice Beam hurts severely enough to grant Glaceon some good use and potency.
- Floatzel doesn't really need Aqua Jet since its Speed is extremely high already. Waterfall's flinch chance shines greatly here, and Ice Fang and Brick Break work brilliantly for coverage. Pursuit is great for taking out anything that would try to switch out from Floatzel - physical attacks are the order of the day here with Floatzel's higher Attack stat.
- Finally, Staraptor. STAB Brave Bird and STAB Return combined with Close Combat's coverage are Staraptor's claims to fame, and the final attack is filler - Quick Attack and U-Turn will do nicely for fillers.
Also, you need to post the items you intend to use for your Pokemon.
