if u can put it in a moveset like in the example, i can implement itAlright, so, Rankings.
I would honestly put both mega latis in A right now. both hit rather hard, have great speed, and are two of the few available offensive defogers in the tier besides mega Burd Jesus. Mega Latias also comes with access to Wish, a valuable support move and semi reliable recovery option, along with both getting roost and Recover. All in all very solid choices, but don't get any higher thanks to a weakness to common attacking types' priority.
Both Mega Zards also belong in A in my opinion. While Zard Y fantastic, destructive wallbreaker, it comes with a NASTY 4x rocks weakness and only average speed. Zard X also comes with a Rocks weakness, but it is not as bad. What keeps it from A+ or S is it's average speed and the fact that with the large # of fairies in this meta, it HAS to run roost or risk killing itself with Flare Blitz. This also limits coverage options meaning that Zard X will struggle against mega Alteria and mega Diance.
In S tier, I would definititely place mega Metagross and mega Mawile. Mega Metagross' high speed, tough claws, good bulk, and coverage options, combined with the ability to bosst its speed and hold an item all combine to create a powerful top tier threat. Tough Claws Bullet Punch helps too.
Mega Mawile is S because it hits like a truck and has priority sucker punch alongside SD and good coverage options. The ability to hold an item only increases its viability by allowing it to passively heal via leftovers or go banded.
Mega venusaur belongs in B rank. It's a good wall, and lefties helps it a lot, but it just isn't bulky enough to take constant punishment and its recovery is too easy to stall out.
I might post a few more opinions later.
Im sorry, thats the rules xD