https://pokepast.es/4863323236b19ccd
Mega Gatr for Megas in Champs OU.
Mega Gatr is surprisingly very good. The thing is that you have high Atk, good bulk, and setup with strong stabs.
We aren't used to Dragons having strong stabs without drawbacks. On using it you realize how effective this simple change made Gatr. Just +1 Body Slam does 80% to Phys Def Rotom W, Slowbro gets cleanly 2HKOed. I really never needed Double Edge.
One really funny thing is that Gatr actually is able to outspeed Pult at level 50 with +1. I feel better sad to see this interaction reverse at level 100.
Chomp is here as Raichu Y check. Roseli Berry as team is weak to Fairies especially Meganium as Gatr is walled by her.
Lead Glimm as TSpikes are quite solid and we have like Exca and Starmie as the only other hazard control for Offense.
Prima is here to check Dragons, Samu H. Gambit, pressure Corvi, etc. One really cool thing about Prima is that it completely walls our own Gatr so in Ditto MUs you can repeatedly break with Gatr and keep going Prima. This makes Ditto MUs quite playable.
Annihilape is here for detering Defog, blocking Spin. He is also here to check dangerous fighters like Sneasler, Mega Lop, Raptor, etc. also can heavily chunk fairies. He is still surprisingly solid. I thought he would not be good with new Rage Fist. One thing to look out for it Ditto, for some reason, copies your Rage Fist Power as well.
Jolly Black Glasses Gambit as we need to outspeed defensive fairies and due to Level 50 quirk, Max Speed Modest Primarina speed ties Jolly Gambit so people just try to outspeed Adamant Gambit.