It maybe an old team, but still perhaps flip through the advanced trainer's guide in the RS section to check on some basic info to the start of team making ^_^; for example, having both psybeam and psychic is a big no no...
Kyogre- [speed + / atk -] @ lum berry
EV: Sp.atk and speed
-hydro pump/water spout
-thunder
-ice beam
-ancientpower/rest
Ancientpower is sometimes used just in case of Shedinja... who is famous for being a Kyogre mauler. Hydro Pump/Water Spout should be used for more brutal power. Boost your speed with personality in order to gain the sweepage speed Kyogre is slightly lacking on.
Mawile- well... can't do much here hey? I made a set for it in another thread regarding NUs and UUs...
Gardevoir- [sp.atk + / atk-] @ lum berry
-will o wisp/thunderwave
-thunderbolt
-psychic
-destiny bond/light screen/wish
(feel free to add in calm mind somewhere too)
Gardevoir can do too many things... so many that it's so scary.
Sceptile- [def or sp.def + / atk or sp.atk -] @ leftovers
-leech seed
-sub
-2 of the following: protect, toxic, leaf blade, aerial ace, earthquake, crunch, dragon claw, brick break, quick attack
Excellent leech seed abuser... some peopel do have it as special sweeper but then... not the best one there is out there for pure special sweeping. I have seen a physical sceptile which completely took me by surprise before... o.o; aerial ace should be used just to have something to use against Ludicolo (the most famous leech seed user, equal with Celebi)