I'd get rid of Groudon... you're team doesn't need an "uber"/ legendary/ whatever it's good enough as is, plus you really don't need the Sunny Day change nor Solar Beam on Sceptile.
Milotic: Good.
Blaziken: You only need one fire move on him. The following is the most useful...
-Brick Break/ Sky Uppercut
-Rock Slide/ Earthquake
-Bulk Up
-Overheat/ Flamethrower/ Blaze Kick
Sceptile: Go with...
-Leaf Blade
-Dragon Claw
-HP Fire
-Crunch
(Use -attack +special attack (or) +speed personality & put EVs totally into speed & special attack)
Metagross: Agility over Light Screen is my suggestion, but the rest looks good.
Alakazam: Perfect.
(Same EV/ Personality suggestion as Sceptile.)
Lanturn: Good, but maybe Confuse Ray over Thunder Wave. I prefer the standard Surf, Thunderbolt, Thunder Wave, Confuse Ray... but this could work well too.
Hope this helps. Good luck!
P.S. - Just be aware that you have a 3x Ground Weakness & no Ground immunity. You might want to replace one of these with a flying type or even bring Groudon back, but I think that would hurt your team setup more than it would help seeing as how Drought would work against 4 of your pokes in one way or another.