I have both Pokemon X and Pokemon Y.........i just don't know how to reveal my Groudon's primal form,, the same goes for Kyogre.
thank you in advance
They cannot. Groudon and Kyogre's Primal forms will only be usable in Omega Ruby and Alpha Sapphire onwards. Also the new items required for the form change "Red orb" and "Blue orb" do not exist in X&Y and only exist in Omega Ruby and Alpha Sapphire.
Source: Own knowledge and facts in-game.
You can't, Groudon and Kyogre can only primal revert in Omega Ruby and Alpha Sapphire, so you'll need one of those two games to get Primal Groudon and Primal Kyogre.
Primal evolution doesn't exist in those games
There is no problem here as primal evolution was not introduced until Omega Ruby & Alpha Sapphire, since the item 'Red orb' and 'Blue orb' are not obtainable in the games neither is primal evolution.