Since you're new, you should probably be sticking to the 252/252 EVs. People usually add defenses in case they want to survive specific attacks (like putting 180hp/180def I think on a Choice Specs Gardevoir so that it'll survive Brave Bird from Talonflame and OHKO back with Thunderbolt) or some speed EV's to edge out mirror matches (like 8 speed EV Rotoms) but you will know what you need through normal play.
Next, you will need to list your intended items for each member, since that can change recommendations for it.
Note: I'm assuming Spd in your list means speed. Speed is usually abbreviated "Spe" since "SpD" is special defense. Also I'm assuming this is for singles/Smogon OU, and not VGC.
Rhyperior - I'm not a big fan of trying to increase its speed, but if you really must run Rock Polish set, it's gonna be quite unexpected. You should run Jolly to maximize the things you are going to outspeed. I'd recommend putting a bulky Rock Polish set on something like Metagross instead, as its speed is already pretty decent, and keeping Rhyperior as a defensive wall with either Stealth Rock, or as a Choice Band user with your listed moveset.
Malamar - Topsy-Swagger combo doesn't sound so great, which can be achieved separately by Charm and Confuse Ray. Personally, I'm not a big fan of Malamar in singles, but if you must run it, I would do end game sweeper style Choice Scarf + Superpower instead, where the goal of the rest of your team is to eliminate all ghosts so that Malamar can sweep with fast Superpower.
BTW, give Alakazam another chance. Frail doesn't mean bad, and Focus Sash item + Magic Guard ability means it always goes down in 2 hits. Zam is good for revenge KOs or endgame sweeping when you've eliminated everything with priority, or faster than Zam.
Machamp - Assault Vest or Choice Band are ideal items and you will run 4 attacking moves on it. Try this set instead:
* Knock Off (way better than Payback, but you will need to breed again)
* Dynamic Punch
* Stone Edge
* pick one of Bullet Punch, Thunder Punch, Ice Punch (all of these need some breeding)
Hydreigon - Swap Hyper Voice with Flash Cannon, gives you more coverage and is great for hitting Fairy switch-ins. I presume you will be using Choice Specs or Choice Scarf or Expert Belt.
Drapion - Sniper doesn't boost critical hit chance, it increases the damage done by critical hits. Without Focus Energy, I would not recommend Sniper. Since you're already on the defensive thing with Drapion, you might as well make it a toxic staller with Battle Armor ability instead. Replace Venoshock with Toxic and one of the other moves with Protect. Item is Leftovers.
LAST POKEMON SUGGESTIONS
1. High Special Defense and team support - Sylveon, Florges, Blissey
2. Greninja w/ Protean ability - Has exactly what you described in what you need to get rid of Ground type and Dragons. Moveset is
* Ice Beam
* Grass Knot
* Surf (or Hydro Pump)
* pick one of Dark Pulse, Extrasensory, Shadow Sneak
P.S. Have you tried joining an online battle simulator like Pokemon Showdown, PBB or Pokemon Online? This allows you to test your team before you take time to do the breeding in your game.