Because of Groudon this team becomes uber.
Most pokemon here would have a very hard time working in ubers so i suggest ninetails.
I dont like solar beam it covers little in Ubers and is probably a 3hit ko on specs or scarf kyogre because of no stab and sheer bulk in ubers. (with no evs or beneficial nature kyogre has 341hp and 316spdef then it possibly carries calm mind now try ko that with solar beam with 238 atk :) before it water spouts you and kills you even in the sun)
I suggest replacing it with stealth rock then iron head with stone edge as iron head also covers not much.
This allows you to go adamant and loose the def loss.
Ninetales (F) @ Leftovers
EVs: 128 HP / 120 Def / 8 SAtk / 252 SDef
Calm Nature (+SDef, -Atk)
heres my favorite set credit to trachy who i got it off.
Ninetails gives your pokemon a chance making them OU.
Stealth rock........... ok so you have espeon but espeon could be dead or you may get stealth rock from a unexpected pokemon, this is why you should consider a spinner.
Replace solar beam with bug buzz mainly because it gets high powered stab and covers some threats in your team plus is reliable when the rain is up.
As for morning glory im not sure its good with stealth rock weakness but then comes along a psyichal pokemon that carriers stone edge.....
I also prefer swarm but many dont :)
Also if i hadnt said go timid.
Well its safe to say no one will out speed this pokemon in the sun.
As for the moveset im not to keen on giga impact, maybe return or poison jab.
Other than that the moveset is good.
Keep this one alive 2 pokemon with 4x srock weakness is not good.
Expert belt isnt a good choice, shadow ball is super effective on 8 pokemon in OU out of around 60, concelduur comes in......
This is why psychic is a better option if you keep this style of set.
If you use this style of set substitute is also a good option but any pysichal pokemon coming in will ko this pussy cat.
I normally go Psyshock, hidden power fire to counter forretress, shadow ball and calm mind with life orb and leftovers though this is the sought of set expert belt works great on.
This guy hits like a tank but is soft as paper, solar power gives him the power of specs but with the after effect of a life orb giving you monoverability*(cant spell).
4x stealth rock and any hit thats super effective will likely take it out so give it timid because 109 base speed isnt that special in ou with all these scarfers and pokemon like starmine.
Also Dragon pulse covers not much so maybe go hidden power rock.
Why jolly with 252evs and no jolly in sun it gets 518speed, go adamant and maybe replace synthesis with sleep powder.
Sleep powder will allow you to swords dance while they switch other than that good moveset and replace the item for life orb.
i hope this helps in some ways