Here's (in my opinion) a very solid Primal-Groudon team, with a Rocks 3-Attacks Bulky Offensive P-Groudon. It features a Pyukumuku, which has proven a very effective gimmick in the tier. It also has a mixed attacking Kyogre, Taunt Mega Mewtwo Y, Heart Swap Magearna, and Defensive Father.
https://pastebin.com/G83KNSaP