I'm a little in the dark on the HP, I'm guessing its Hidden Power but I could be wrong. Now for some ideas. I've worked with all of these Pokemon exept for Armaldo, Glalie & Jolteon. But I'm kind of good with Lightening types, so I'll try with Jolteon.
Armaldo: I like the moves, Earthquake and Rock Slide. That keeps it close to home with its Bug/Rock types. Thats good. Like I said I can't help out with the HP part, I'm sorry about that. Brick Break seems good since it destroys those pesky moves that the Psychics put up. Like Light Screen and Reflect. I'd keep him the way he is.
Magcargo: I never really was crazy about raising the Special Attack and Defence of a Pokemon. Unless I was using Overheat and it still didn't work for my Torkoal. Acid Armor raises Evasion, which is a good thing. Evasion is one of those things that can make your opponet mad because they barely can hit you. So thats a good thing. Flamethrower keeps it close to home with its Rock/Fire type and thats good too. When I used Slugma/Magcargo on my first game of Ruby, I used its Rock Throw. But Armaldo makes up for that with its Rock Slide though. Overall it looks good.
Tropius: First off, I put my Swellow in the my PC Box and started to use Tropius. Why? I needed a Grass Type and I started with Mudkip and I didn't want to use Lotad mainly because I already had a Water Type. But besides that, I looked over your move list for Tropius and it looks solid as it is. Healing from Lefties and Synthesis should keep your Tropius in good shape. Sunny Day should help out the HP Fire and Solarbeam is a good attack. Overall it looks good.
Pelipper: When I used my Pelipper, I didn't evolved it until it knew Hydro Pump. But your stratigy looks good as it is. Surf is a good attack and needed for the game to get around. Ice Beam is another good attack, mainly for the fact that it can Freeze your opponet's Pokemon. Aerial Ace can't be dodged and it attack, to my knowlage, that right there gives it a good advantage over your opponet's Pokemon. It looks better than the Pelipper that I was using in Ruby and thats a good thing.
Glalie: An Ice Type, something I've barely, if any at all, used before. I've already mentioned that Ice Beam is a good move so it would work ok with an Ice Type like Glalie. Crunch, now that move I liked better than Bite. But it was hard to find for me. I don't know why though. In Silver my Pokemon felt it by the Houndoom in the E4 and I can tell from that its a good move to have. Expecially if you're fighting those pesky Psychic Types. Like the Special Attack and Defence thing, I wasn't really a big fan of Explosion/Self Destruct. It puts reason to the saying 'If I go down, you're coming with me', but then again I wanted to have the Pokemon around to get the Experiance. But I can see it could help out if you're fighting a very strong Pokemon. It could faint it with the attack though. Hail's like Wrap or Fire Spin, attacks every turn and hurts both Pokemon, unless its of that same Type. I'm not for sure on this move though. Toxic, it hurts more than a normal Poison attack. Which is a good thing in a Trainer battle, you'll have to watch the HP of the Wild Pokemon in a Wild Battle if you use this. Spikes is like Hail in my case, I don't know much about it. Its not the best advise for Glalie, but I'm trying to help out.
Jolteon: Try Agility, the Speed boost that Jolteon should get from it should give it a sharp enough edge to stop your opponet's Pokemon. Thunder/Bolt, both moves are my favorites and either one would work good for Jolteon. Shock Wave would be a good third oppion, but Thunder/Bolt would probly be better. Rain Dance helps the HP Water (again, I don't know what the HP stands for, unless its Hidden Power) so that seems helpful for that. Overall, Jolteon looks to be in good shape.
With Leftovers on your Pokemon, they should be ok in the HP department. Unless you get hit by a Horn Drill or Fissure, but that can't be helped unless your Pokemon has the ability to stop those attacks. Note that these are my thoughts and ideas. Just thought I would try and help out.
